Hi Pradeep,
I can barely understand your queries, but I will try to answer...
0. If you always want the same Message in all cases, use FC_0001, but if the Message (for example, the print-out) should depend on the Destination Country, then use FC_0004.
1. The Activity Sequence is assigned to the Process Template, and the Process Template is assigned to the Legal Regulation (IMG activity: Control Settings for Application Areas by Legal Regulation of a Legal Code).
2. The Action Profile is assigned to the Message, through the Action Definition.
I hope that helps.
Regards,
Dave