Hello Paul,
Before providing you with the documentation I would like to point out that CA SAM requires trained professional to implement the tool due to its complexity. In addition to that support is limited to product installation, program configuration and usage experience, while data load and connector configuration would require CA Services engagement. See the CA SAM support statement below:
CA Software Asset Manager Support Announcement - CA Technologies
Please use the below link which will take you to the CA SAM documentation page:
CA Software Asset Manager
Latest System Administration Guide should come with CA SAM installation package.
Hope that helps.
Thanks,
Alex