Assign account to team depending on parent business unit

Hello!

Lets say i have 2 parent business unit A and B. Under A i have 2 child BU 1 and 2 and under B i have 3 and 4.

I need to share a record to a team from BU 1 to BU A and a record from BU 3 ti BU B. 

So the assigning of the record will depend on the parent BU.

Is there any way to get this info on what parent BU a user has as a member of ex. BU 1.