An extension that automatically generates faces?

Hello friends.
I have a question: is it possible, with an extension, to automatically create faces in places where groups touch each other?
I imagine something like clicking on the faces of the groups and new faces are automatically generated.
P.S. Excuse me for my bad English.

You must enter into a group’s context to click on faces. This means you’d need to back out of the first group and enter into the 2nd group to click it’s face, so the first group selection might be lost.

Instead perhaps @eneroth3’s Boolean extension will let you create a non-destructive intersection by clicking the two groups ?

does Curic’s Copies help you?