What are you looking for exactly? A way to separate the Magento admin into separate stores? Magento's native ACL do not facilitate this.
Magento can have many store views to one admin, but not many admin views to many stores.
There have been a few attempts at granular store-view level ACLs by 3rd party extension manufacturers to achieve this. So you could look at those.
We've faced this challenge in the past for customers who wanted to white-label their store. As a result, we have used one of two methods.
- Set up many separate stores, with separate installations - then feed the sales data back to a central installation
- Implement admin store-level ACLs.
Either way, its not that easy. Magento wasn't strictly designed for this purpose.