Examples of managing accounts within accounts? [on hold]

I am working on a system that allows our company to create and manage multiple partner accounts, and partners can create and manage multiple customer accounts. (Accounts here are business entities. They contain users and other items.) Our company admins need the ability to add users to the company account, a partner account or a partner's customer account.

UX problems that arise include:

• Facilitating company or partner navigation to different sub-accounts
• Making clear what account you are viewing
• preventing accidentally adding users or making changes to the wrong account
• partners cannot see outside their own scope but the company can see all.

I have some designs ideas but it occurs to me this problem must have been solved before. I did some googling and logging into many systems I have but none have a similar complexity of accounts within accounts. Either that or I don't have access to the top-level.

I'm hoping you can post or point me to benchmarks I can view (images or examples) that attempted to solve this problem. Even similar concepts from outside this would be welcome.