Payment Hierarchies

Hi 

I work for a large group covering UK US and EU

We have D365 on-premise version PU15

My question is about payment hierarchies:-

1 can you have more than one in the system?

2 if so can a legal entity be in more than one?

3 how do you set a hierarchy against a specific user so they get the one they have control over (i.e. UK) and not one of the others (i.e. US)?

Cheers 

David