2 answers
You have few optionsOut of the box, there are no relationships between Opportunity - Quote X Order, if you want to auto populate order line item from Opportunity line items or Quote then you have to write 1. Apex trigger2. Process Builder with Flow 3. AppExchange app that will help you to "​Automatically Generate Orders from Opportunities or Quotes" ​https://appexchange.salesforce.com/listingDetail?listingId=a0N3000000B5iwHEAR