How do you import a standalone track into a take folder?

Hi folks,

I have a "take folder" with a few attempts at a vocal track, but before I learned about this feature, I recorded another take on the vocals, which is still a separate track, outside of the take folder with the other takes. How do I move that first take into the take folder? When I drag it in, it just replaces the entire contents of the take folder.

Thanks!

-Mike Kaplan