All users on all PCs on the network report

Hello everyone, I am very new to the Symantec Altiris suite and am looking for some guidance. In our organization we have about 20 sites that are moving to this suite as our asset management and user management suite. My question is how can I make a report that will make a list of all the computers at our site with all the user accounts that are associated with it? I have been able to make one that has the primary user, but for a couple different projects, we need to see all the users that have ever logged into any workstation.