What is the best way to organize designs for different phases?

Hello community :wave:

I have to show different page designs at various development phases. For example, phase 1 will be changed based on the current design, phase 2 will be changed based on Phase 1, and so on.

I have a master design file that includes all key UI designs, so I use the branch for phase 1, but since Figma doesn’t have the sub-branch for the time being, I am wondering how you guys handle this situation or if there is any suggestion to this?