Copy contract pricing from sales contracts in billing

Hi

I Have a requirement to Copy contract pricing agreements from sales contracts during resource related billing creation.

At the time of resource related billing is performed, the agreed contract rate should be taken into account when pricing is performed in SAP. So, the agreed price needs to be copied from the contract condition record into the resource related billing transaction (sales pricing) as a condition record.

Can i get the solution for this?

If anybody knows the solution please help me out. Appropriate Points will be awarded. Thanks in advance.

Regards

Ravi