You can find information in the Windchill Help
Part usage attributes
http://www.ptc.com/cs/help/windchill_hc/wc101_hc/index.jspx?id=PMPartAttributesRef&action=show
Editing in PSB
http://www.ptc.com/cs/help/windchill_hc/wc101_hc/index.jspx?id=PMUsesTabEdit&action=show
And the Configuration mgmt overview
http://www.ptc.com/cs/help/windchill_hc/wc101_hc/index.jspx?id=CCMOviewConfigMgmtIntro&action=show