Asset Management is concerned with tracking your Assets, whether they are physical (such as a laptop, desktop, monitor, servers) or non-physical (software licenses, etc). Asset Management Suite needs to have electronic data forwarded to it from your CMS box so that it can associate/create Assets based on the electronically discovered data from CMS's Inventory policies.
Unfortunately for you, Altiris is not typically an application you can just "figure out"; if you are serious about using it, find a Symantec partner company and arrange for some consulting, or schedule a training course which may be available at http://www.symantec.com/business/training/product_training/detail.jsp?pkid=client_management_suite