Turn on experimental slide merging to combine a child branch back into the parent presentation.
Click on a User Profile > Go to Account Settings > Innovations.
Toggle PowerPoint/Slides merge On.
Open the file’s DLM tab and pick the branch you want to merge.
Click ⋮ > Merge with parent.
In the side‑by‑side view, choose the slides to include and reorder if needed.
Click Complete Merge. The merged version appears in DLM with full history.