Prem,
I am becoming confused; you have said two different things.
When expert Caetano asked...
You want to ensure that two different orders from two different materials, with no relationship between them are overlapped?
...you answered 'yes'.
Then, you go on to say
....one SFG feeds to another....
so this would mean that they are related. Which is it? Related, or not related?
I will assume that SFG1 exists in the BOM of SFG2. If so, expert Caetano has given you the solution above.
MRP will create planned orders with the offset you requested. When you convert these planned orders to production orders, they will also be offset.
Best Regards,
DB49