copy contorl from F2 to credit memo Request

Hi All,

I have a scenario where in when I create a credit memo request with reference to the original billing document , I want to copy only one condition type from F2 as far as pricing conditions are concerned without disturbing any other thing.

Do we have any standard routine to do this or do I need to create a new one .

The scenario is my business wants to return only the excise amount back to the customer as a part of the credit memo in certain cases . But this should be achieved by

1. creating a credit memo with reference to the original billing doc (F2)

2. Copy only the excise condition type in credit memo request .

Is this possible. Please let me know as soon as possible.

Thanks

Sridhar.