How do you add a ribbon tab to a workspace?

I think I just answered my own question, you right click on Ribbon in the workspace tree, and click append or insert.
I have to say, that fooled me as in every other part of CUI, that means "define new".
Given the unstability of CUI in acad, I have learned not to experiment but maybe bcad is different.
I held my breath and clicked Append, and got the list to choose from. Whew, close call...