I think we need some more details about what you are trying to do. what does 'decomission the SITE' mean? you have a set of servers registered in bsa that you need to remove from bsa? what is the 'main programme' ?
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A great place to start is here: https://docs.bmc.com/docs/display/bsa85/Quick+start+-+BLCLI+tutorials
That should help you get your head around running BLCLI, then you can come back with more specific questions so that we can better assist you.