In Azure Data Factory (ADF), each instance should be connected to only one Git repository. This ensures that all changes and versions are tracked consistently within a single source of truth that is the ARM template. However, you can create multiple local branches within that repository to facilitate parallel development. This allows different team members to work on separate features or fixes simultaneously. Once the changes in these local branches have been tested and validated, they can be merged into the collaboration branch. After merging, you can publish the changes from the collaboration branch to adf_publish branch and deploy it to the next higher environment.

Different environment like dev , UAT, preprod, prod would have different ADF instance and corresponding repositories.