Hm, I'm not sure I follow.

We started with:

Angel & Angel Investigations (Buffyverse)
Rupert Giles & Angel Investigations (Buffyverse)

The Rupert tag matches your description already:

Giles & Angel Investigations [Any: Angel Cordelia Gunn Wesley Fred Doyle Connor Lorne] (Buffyverse)

Did you want the Angel one to be:

Angel & Angel Investigations [Any: Cordelia Gunn Wesley Fred Doyle Connor Lorne] (Buffyverse)

?

I took Angel out because Angel & Any: Angel doesn't make sense to me.

I will not approve "X" or "Any" & the larger group.