You can achieve this by setting up Accounting. You can setup Xerox Standard Accounting and on a user basis set the amount of copies, scans etc..
The users you would not like to have access to a certain function then those would have minimum allowed values.
For more details on this feature please check this link
Is there a way to limit what device functions are available to the user once they log in. We want to limit which users can make copies on the device.