Hi @OctaneHolly, welcome to the community!

So if I’m understanding you right, your ultimate goal is to have two separate audiences; one that is consented for SMS, and another for one that is consented for Email.  Since those two audiences overlap in your three groups, I think the most practical way of doing this without creating yet another List or have more Lists to manage is to create Two Segments, one for Email and one for SMS.  

• SMS Segment : those that has consented to SMS in List Group A OR in List Group C
• EMAIL Segment : those that has consented to Email in List Group A OR in List Group B

Does that approach work as you require?

Hey Joseph - I do segment already that way for a number of things (we have a ridiculous number segments for various reasons).

It may be my peculiar way of wanting to handle things, but I just want my list to be a bit more clean and collapse my list counts.  It may be a little OCD, but I can’t stand that the Group B people are throwing off my counts LOL

@OctaneHolly I totally understand!  Don’t get me started about being super tediously strict about naming conventions and tagging to keep everything organized as well!

Then, I think you might have answered your own question here, no?  I think you can do a one time “cleanup” of your Lists into your ultimate canonized Lists and then you won’t have to deal with the overlapping Groups and have proper Opt-in counts and growth reports.

Remember, you can quickly convert a “Segment” into a List - so you might be able to build a Segment to pull together the right audience, and then convert it into a List. 

After you’re all done, you can then cleanup and archive/delete anything you don’t need if you want to keep everything nice and tidy.

Yea, thanks - that’s roughly what I figured I would have to do.  I guess I wanted someone to essentially confirm there wasn’t another magical way to do it that I was missing.. Thank you!  I needed to more or less say it out loud.