How do you create a new version?
To create a new Version, go to Settings--> Versions--> Then click 'Insert.'
The new version will include the formulas from your other Forecast versions. However, non-formulaic data (i.e. manually-entered or imported cells) will NOT automatically be copied over. In order to copy over data from another version, go to Settings--> Versions--> Then click on 'Bulk Copy' to select which version you would like to copy.
For more information, please see Anapedia: https://community.anaplan.com/anapedia/around-the-platform/settings-tab/versions/bulk-copy-of-versions0