You can use the Versions and history panel to create versions (which are View only) and branch a version to create a new workspace. You can also compare history entries in workspaces and versions, and any combination of the two. For more information, see Comparing.

For additional Learning center resources, follow the self-paced courses here: Branching and Merging (Onshape account required) and Document History and Versions (Onshape account required). You can also follow the learning pathway course here: Onshape Fundamentals: Data Management (Onshape account required) and the technical briefing articles here: Understanding and Working with a Document’s Historical Data (Onshape account required) and Gitflow Version Management (Onshape account required).