If I'm reading you right, you want to pass a value back to the calling package ??
Unfortunately, this is not as obvious as it seems
One technique I've seen work is to pass the GlobalVariables pointer to the child package. This creates an implicit link so you can update variables in the parent package.
Check this article which has details about how this si done,
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnsql2k/html/sql_busintbpwithdts.asp
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Colt 45 - the original point and click interface