Awesome that works perfectly.  I'm adding fields to this now but having an issue with adding a lookup field to the account table and a picklist field.  In other words, The above works fine.  But if I go to add a new field that is a lookup to the Account table, I can get it to show up using apex:inputfield, but I can't save the value that way.  And using apex:inputtext is no good for a lookup field.  Same thing for a picklist type field.

In the working code below, the field called Account is the lookup, and the fields "Title Function" and "PingOne Subscriber Status" are picklsit type fields on lead.  Any idea if it's possible to render those as lookups/picklist type fields, and allow the user to save their selection to that underlying field?  Thanks a lot for your help:

vf page:

<apex:page standardController="Lead" extensions="DependentObjects" id="UseCaseDisplay"  label="FeatureCategoryReport" >
    <apex:form >
    <apex:messages ></apex:messages>
    
    <apex:pageBlock title="New Lead" mode="edit">
    <apex:pageBlockButtons >
    <apex:commandButton action="{!submitSave}" value="Save"/>
    <apex:commandButton action="{!cancel}" value="Cancel"/>
    </apex:pageBlockButtons>
    
    <script>
     function callUpdate(){
         updateCategory('abc');
         }     
    </script>
    
    <apex:actionFunction name="updateCategory" action="{!noop}" rerender="_features"/>
    
    
    
        <apex:pageBlockSection id="section1" title="Lead Information" columns="2" collapsible="true" ondblclick="toggleInputFieldsSales();">
        
            <apex:pageblocksectionitem >
            <apex:outputLabel value="First Name" for="firstname"/>      
            <apex:inputtext value="{!FirstName}" id="firstname"/>
            </apex:pageblocksectionitem>
           
    
            <apex:pageblocksectionitem >                        
            <apex:outputLabel value="Last Name" for="lastname"/>      
            <apex:inputtext value="{!LastName}" id="lastname"/>              
            </apex:pageblocksectionitem>
            
    
        
            <apex:pageblocksectionitem helpText="The name of the company where this Lead works. Whereas the 'Account' field links to an actual Account record in our system, the 'Company' field is just a text field, and may include errors or abbreviations.">                        
            <apex:outputLabel value="Company" for="company"/>      
            <apex:inputtext value="{!Company}" id="company"/>              
            </apex:pageblocksectionitem>    
    
            <apex:pageblocksectionitem helpText="If this Lead represents a company for which an Account record has already been created, link to that Account so this Lead's Activity records can be included in Account Activity reports.">                        
            <apex:outputLabel value="Account" for="account"/>      
            <apex:inputField value="{!Account.Name}" />
            </apex:pageblocksectionitem>       
     
            <apex:pageblocksectionitem >                        
            <apex:outputLabel value="Email" for="email"/>      
            <apex:inputtext value="{!Email}" id="email"/>              
            </apex:pageblocksectionitem>
            
            <apex:pageblocksectionitem >                        
            <apex:outputLabel value="Existing Customer" for="existingcustomer"/>      
            <apex:inputCheckbox value="{!ExistingCustomer}" id="existingcustomer"/>              
            </apex:pageblocksectionitem>              
    
            <apex:pageblocksectionitem >                        
            <apex:outputLabel value="Title" for="title"/>      
            <apex:inputtext value="{!Title}" id="title"/>              
            </apex:pageblocksectionitem>   
            
            <apex:pageblocksectionitem >                        
            <apex:outputLabel value="PingOne Subscriber Status" for="PingOneSubscriberStatus"/>      
            <apex:inputtext value="{!PingOneSubscriberStatus}" id="PingOneSubscriberStatus"/>              
            </apex:pageblocksectionitem>                 
              
            <apex:pageblocksectionitem >                        
            <apex:outputLabel value="Title Function" for="titlefunction"/>      
            <apex:inputtext value="{!TitleFunction}" id="titlefunction"/>              
            </apex:pageblocksectionitem> 
    
    
    
    
    
    
        
        
        </apex:pageBlockSection>   
    
    
    
    
    
    <apex:pageblocksection id="_category" columns="2">
    <apex:outputLabel value="Lead Source" for="category"/>      
    <apex:selectList value="{!theCategory}" size="1" onChange="callUpdate();"  id="category">
       <apex:selectOptions value="{!categories}"/>
    </apex:selectList>
    </apex:pageBlockSection>
    
    <apex:actionRegion >
    <apex:pageblocksection id="_features" columns="2">
             <apex:outputLabel value="Lead Source Detail" for="features"/>
             <apex:selectList value="{!thefeature}" size="1" id="_features">
             <apex:selectOptions value="{!features}"/>
             </apex:selectList>
    </apex:pageBlockSection>
    </apex:actionRegion>
    
    </apex:pageBlock>
    </apex:form>
</apex:page>

controller:

public class DependentObjects {
    private final Lead theLead;
    public List<SelectOption> optionList = new List<SelectOption>();
    public List<SelectOption> options = new List<SelectOption>();
    public Boolean isCategoryChosen{get; set;} 
    public String selectedAccName {get; set;}
        public String LastName {get; set;}
        public String Email {get; set;}
        public String Company {get; set;}
        public String FirstName {get; set;}  
        public String PingOneSubscriberStatus {get; set;}  
        public String Owner {get; set;} 
        public String RecordType {get; set;} 
        public Account Account {get; set;}  
        public Boolean ExistingCustomer {get; set;}               
        public String Title {get; set;} 
        public String TitleFunction {get; set;}         

    public String theCategory{get; set;}        /* String value for the category */
    public String theFeature{get; set;}         /* String value for the feature */
    
    public DependentObjects(ApexPages.StandardController stdController) {
        selectedAccName = '';        
        theLead = (Lead)stdController.getRecord();
        isCategoryChosen = false;
        }
  
    /* Getter which dynamically generates the categories from the Feature_Category__c object. */
    public List<SelectOption> getCategories() {
      Set<String> uniqueCustomObjectSet = new Set<String>();    
      options = new  List<SelectOption>();
      
      for(LeadSourceHidden__c sl:[Select LeadSourceHidden__c,Name 
                    From LeadSourceHidden__c 
                    WHERE LeadSourceHidden__c != null ORDER BY LeadSourceHidden__c DESC ]) {
          uniqueCustomObjectSet.add(sl.LeadSourceHidden__c);
          }

      options.add(new SelectOption('','- None -'));      // Initial value
      for(String s :uniqueCustomObjectSet){
        options.add(new SelectOption(s, s));
        }
        
      return options;
      }

    public List<SelectOption> getFeatures() {
       optionList = new List<SelectOption>();
       optionList.add(new SelectOption('', '- None -'));    /* Add a null option to force the user to make a selection. */

      if(theCategory != NULL) {   /* If a category has been selected then query for the related values */
        for (Campaign f : [select Name,Type from Campaign f where f.Type = :theCategory LIMIT 40000 ]){
          optionList.add(new SelectOption(f.Name,f.Name));
          }
        }
      isCategoryChosen = true;  
      return optionList;
    }

    public void changedFeatures() {
        optionList = new List<SelectOption>();
        getFeatures();       
        }
    
    public void setCategories() {
        }
    
     public PageReference noop() {
        ApexPages.addMessage(new ApexPages.Message(ApexPages.severity.info, 'entered noop'));
        return null;
        }
    
    public String getCategory() { return this.theCategory; }          /* Getter for the category value */
    
    public void setFeature(String s) {  
        this.theFeature = s;
    }         /* Setter for the feature value */
    
    public String getFeature() {
        return this.theFeature;
        }            /* Getter for the feature value */
    
    public Boolean getisCategoryChosen() {
        return this.isCategoryChosen;
        }  /* Getter for the feature value */
        
        
        
public PageReference submitSave(){

Lead  l = new Lead ();

l.LastName = LastName;
l.Email = Email;
l.Company = Company;
l.LeadSource = theCategory;
l.Lead_Source_Detail__c = theFeature;
l.FirstName = FirstName;
l.PingOne_Subscriber_Status__c = PingOneSubscriberStatus;
l.Existing_Customer__c = ExistingCustomer;
l.Title = Title;
l.Title_Function__c = TitleFunction;


insert l;
        l.clear();
        PageReference page = new PageReference('https://cs15.salesforce.com/00Q/o');
        page.setredirect(false);
        return page;
}      
        
        
        
}