Looking for an App to have premium levels for customers without them paying

[ChrisCost]

In short, we would like to find a way to have customers be assigned levels/roles/titles, such as "manager". Depending on the level of the customer, there will be specific limits to what orders they can make, namely maximum quantities. Managers will be able to order any quantity they want, as well as have the ability to see our levels of inventory, while normal customers will have a limited max quantity and won't have access to our inventory.

If anyone knows a way this can be achieved, please reach out, I would be so grateful.