You can accomplish what you want in your current release by following these steps.
1. Remove the source database name from the workflow definition for the “Add Objects to CR” step. This way, development can be done from any database and the developer can add the objects from App Designer project that is found in any database. Navigate to Step 13: Workflow Definitions in the Domain Setup Wizard and Edit Details of the “Add Objects to CR” step and remove the value in the “Source DB” field.
2. Remove the requirement for the source database in the “Create Migration Set” step. Navigate to Step 4: Task Code Definitions in the Domain Setup Wizard. Uncheck the “Source DB Required?” checkbox next to the “Create Migration Set” Task Name.
3. Remove the source database from the “Create Migration Set” step in the workflow. Navigate to Step 13: Workflow Definitions in the Domain Setup Wizard and Edit Details of the “Create Migration Set” step and remove the value in the “Source DB” field.
4. When performing the “Create Migration Set” step within a CR, the developer will now need to populate the Source Database at run-time. The developer can specify the Source database by clicking the “Additional Details” tab within the “Tasks” tab of the CR. The Source DB will be enabled and they can choose which database appears.
5. Define which databases are available for Add Objects and Create Migration Set. Go to step 14: Workflow Databases and add any database and specify which ones you want to make available for Add Objects and Create Migration Set.