In Enzyme, you can link/unlink Design Output cards to a pull request.
Open the Design Control card in which you are interested and click on tool you'd like to link to (Github, Gitlab, Bitbucket).
Once a Design Output card is approved, any linking or unlinking of a pull request will return that card into Draft mode.
The card will then once again have to be submitted for approval. This is to ensure traceability and maintain a design history.
Submit for Approval
Once you have entered all the information pertaining to the design control card, you will have to submit it for approval by submitting a change request.
Before a design control card is approved, if needed you can Pullback the change request. The card will once again be a draft state.