With Position Budgeting how far down the departments can we go

Summary:

Customer is investigating the use of Position Budgeting at the Department attribute, and their organisation will comprise of departments reporting into departments. How far down can Position Budgeting associate the budget at department level. For example if there are 10 levels in the department can we work at level 10 all the way to level 1

Content (please ensure you mask any confidential information):

Customer is looking for guidance on how many levels we can operate at with position budgeting at the department attribute. Is there a limit or it can support any number of department levels - any specifics to be aware of?