I have a combination mobile/DNN solution.   The DNN site manages a directory of user information for multiple companies - each securely from another. 

Each company, say Acme, Inc. has one (or more?) administrators - they have access to the DNN site.

Acme, Inc. has hundreds of users that need to be maintained in the DNN database - but each Acme user doesn't have to be a true DNN user.    The information being managed will be meta data - what group they're in, their cell #, etc. 

I'd like to:

• set this up so each company admin has secure access to their company's directory
• (hopefully) import directories and updates via a spreadsheet (eventually active directory - ignore that for now)
• manage the user list - edit/delete/add - columns are pre-determined 
• be accessed by a separate module that will hit the database directly.(out of scope)

How to proceed?    e.g., how do I (if I should) select a Data Forms/Data Viewer module?    What about importing of data - I see lots of modules that import 'users', but not apparently general records to a Data Forms based data table.

Thanks for any and all thoughts!!