is it  possible to bill a PO via CSV import?

if yes then if i bill the PO through CSV import then PO status bill change from pending biling to billed .

i am having Purchase orders which are having more then one reciept. i mean purchase order in recieved in parts . user did not bill the order at the time of when they recieved the order partially. now i want to bill the purchase order reciept-wise.

For Example there is one PO- PO10000000415
having to reciepts- IR10000002091,IR10000002162
now i want to make 2 bills for the above order po one for first item recipet and second for other item reciept but when i click on bill purchase order it picked all the quantity i have recieved but i want that it should pick the quantity ...item reciept wise.