Hi Vikas,
Your question seems a bit confusing.
"Is there any option to adopt price in the Purchase Order from PR like when PR is created manulaly through ME51N." - This is also feasible as you have already mentioned.
Or do you want price to be automatically flow to PO in automatically created PR from other modules?
I have tried maintaining the Gross price in IW31 in Operations-> External Tab. This price flows to the PO.
Regards,