We do not understand your question. Could you be more specific?
Are you trying to use the chaining selection method?
Or, are you trying to create a model of a steel chain?
You need to use 'Menu -> Tools -> Reuse Library-> Reuse Library Management.'
When the reuse library management dialog opens, press F1 to open the Help Documentation for the reuse library.
If you have difficulty, I highly recommend you check with GTAC in your local area for additional assistance.