Assignment of Cancellation Procedure in Service Order in CRM

Hi

I need to copy the cancellation reason at item level from a preceding business transaction of leading transaction type "Composite Transaction" to Leading transaction type "Service Process" or Service Order. Can i achieve this using standard configuration, Can i assign Cancellation procedure to transaction type Service Order. I tried assigning Business Transactions categories Service Contract at Header and Item level to inherit the Cancellation tab but in vain. Can any one give some inputs ?

Thanks in Advance

Vaishnavi