...
Snapshot provides a visual comparison between an initial state of the timeline (baseline) and a modified state.
When applied, the baseline looks like dark grey lines below the targets of the modified timeline.
...
1. Create a Snapshot
To create a new snapshot:
...
On the Planner toolbar, click Snapshot. The Create New Snapshot dialogue box opens.
Click the Link icon. The system saves the snapshot link to the clipboard.
...