# Use Case and Syntax for Variables with Related Values

Construct variables that reference related values, for example an object and fields from the object, and a dataset and dates, dimensions, and measures from the dataset.

For example, the first question on a wizard page asks the user to select an object (`sObjectType` variable). The next questions can ask the user to select fields (`sObjectFields` variable) from that object. The wizard populates the questions about fields with `sObjectFields` from the `sObject` selected in the first question. The following image shows an `sObject` picker first, followed by an `sObjectField` picker.

![This diagram depicts the sObject and sObjectField pickers.](https://a.sfdcstatic.com/developer-website/sfdocs/analytics/media/bi_dev_guide_wave_templates/bi_templatesdev_sobject_sobjectfield.png)

You can take the same approach with datasets and dataset dates, measures, and dimensions. The first question references a dataset (`datasetType` variable). Subsequent questions reference dates (`datasetDateType`), dimensions (`datasetDimensionType`), and measures (`datasetMeasureType`) from the dataset selected in the first question.

Following is template JSON used to render the UI shown in the image, using `sObject` and `sObjectFields` variables. In the `variables` section, notice `CSATField` variable's type info: the `defaultValue` contains a reference to the variable's value `CSATObj` and the syntax is `{{Variables.CSATObj.sobjectName}}`. The intention here’s to replace `{{Variables.CSATObj.sobjectName}}` with the value that the user picked for the variable `CSATObj`.

The `ui.json` file for the template, shown at the top of the example, orders the wizard questions defined in `variables.json`.

```nolang
{
  "ui" : {
    "pages" : [
      {
        "title ": "Page1",
        "variables" : [
          {
            "name" : "CSATObj"
          },
          {
            "name" : "CSATField"
          }
        ]
      }
    ]
  },
  "variables" : {
    "CSATObj" : {
      "description" : "Service Analytics defaults to the Case object. If you use a different object to track CSAT, select it from the list below",
      "label" : "1. What object do you use to track customer satisfaction?",
      "required" : true,
      "variableType" : {
        "type" : "SObjectType"
      },
      "defaultValue" : {
        "sobjectName" : "Case"
      }
    },
    "CSATField" : {
      "description" : "Service Analytics uses your choice to provide a single numerical score to indicate customer satisfaction rating.",
      "label" : "2. Which field on the object you just selected do you use to track CSAT?",
      "defaultValue" : {
        "datasetId" : "{{Variables.CSATObj.sobjectName}}",
        "fieldName" : ""
      },
      "required" : true,
      "excludeSelected" : true,
      "variableType" : {
        "type" : "SobjectFieldType",
        "datatype" : "xsd:double"
      }
    }
  }
}
```

## Variable Value Reference Syntax

```nolang
"${Variables.Dataset1.datasetId}
${Variables.<SObjectVariableName>.sobjectName}"
```