Buyer and consignee different

its depends upon the relationship between B and C
if both are independent and as part of sales then book te A's invoice as purchase in B's books and raise the sale invoice on C, so that this document as purchase for C
if the relationship is there as godown/stores/ own account/consignment
then book the A's invoice as purchase in B's books storage location as C, another entry based on consumption/ consignment sale etc..

Refer consignment chapter, bache
else DM me