Excel to CRM 2011 using ssis script component(c#)

Hi, 

i have two tables A and B. A is parent and B is child in excel. I have loaded A's data into CRM using ssis Script component.For each record, a GUID will be created right? that should be populated into Child B table A's ID field in CRM for each record of B table.This should be done using ssis script component.How can i acheive this??Please help me.