Save a copy of your current workspace as eg. "Atmospherics".
This ensures the original remains intact as this copy is the one you're going to alter. (The original will already be saved under a different name).
Re-load that workspace using "open workspace" and then by selecting the "Atmospherics" workspace (ensures you have the right one loaded).
Go through the tabs and right click and choose delete on any non atmospheric tabs. Continue that until all you have left are the desired pages of atmospherics cues.
Save the workspace once more.
You should now have a cut down Atmospherics workspace with your original workspace intact, and you're simply able to choose between them by loading whichever you want by using open and opening the named workspace of your choice.