Just to double check you are referring to the backend of Joomanager, like when you login to Joomla and then go to the Joomanager component?
I mean just the "access"option in many of the standard Joomla Administration (like menus and articles), where it is possible to set the access to "Public" or some other more restricted access to drive with the user categories.
i.e.: I leave only some categories of users to access some menu items, just selecting such above categories from the Joomla administration menu, using the "access" option and selecting the proper user category from the drop down field.
Thank for your help