How to bundle teams together?

Hello Everyone,

My company contains of seperate teams. These teams however are also connected with eachother.

So for example: i have team 1, team 2 team 3, team 4, team 5 and team 6. But Team 1 & Team 2 are HRM, Team 3 and team 4 are Operations and Team 5 & 6 are Finance. How can I bundle team 1 and team 2 to HRM, and so on.

I want to have an overview of which teams are connected to which department.

Eventually i want to create the opportunity list where i can see what team can do what.

I really hope someone can help me!

Thanks in Advance.