You can Navigate to 'Migrate product' gadget as Designer Studio>Application > Distribution > Migrate Product — To create a product rule that packages work items.
And specify the target as below
Also it depends on your app server, for example if it is weblogic then you need to do setup as below before starting migration:
The source system (in your case 'DEV') needs to have the WebLogic role (as 'PegaDiagnosticUser') defined and a WebLogic user assigned to that role, and the target system (in your case 'QA) needs the security instance created to reference that role. The Data-Admin-System-Target instance is optional.