Good day Channappa,
1. If we create saved RFx from CPPR, it wont create SC in standard. Pls refer the below picture, number 1 & 2 will create the SC but no 3 will not create the SC.
Coming to Transfer the custom fields from PR to SC:
1. Create RFC Functional module in ECC, input for the FM is PR number and output - Line item information along with custom fields value
2. Cal the FM in BAdi " /SAPSRM/ES_SOA_MAPPING", map ECC custom fields with SC Custom fields inside the BAdi.
Hope this will give solution on your requirement.
Regards,
Balaji Narayanan