Is it possible to choose to which termbase a new term should be added?

Hello to all,

I am working with SDL Trados Studio 2015 Freelance edition.

When I'm in the editor view (with the source document on the left, and the target document on the right), I sometimes highlight a term on the left and on the right>then right-click>add new term. However, this adds the term to the first multiterm termbase in the list of termbases added to this project (project settings>termbases). But I would like to choose the termbase to which the new term should be added. 

Does anybody know whether this is possible? And if yes, how to do it?

Thanks a lot!

Best wishes,

Mona