Replying to [Munnu]: Hi,
There is no such thing as a half bill of lading.
I can't even find anything that could be a misspelling.You should ask the seller for a further explanation of what he means.
A guess could be that he, since B/L's normally are given in 3 copies, will give you one (or almost half).
It could be a kind of security for him if you don't pick up the goods from the port (you need the B/L for that).
If he has one of the originals, he will be able to sell to another customer because he can get it out.
If your terms are CNF or CIF, probably he will not get his money until you pick up the goods. but if you don't, he will have to pay demurrage to the port for storing the goods.
I know some of my suppliers will only sell FOB to India because they had lost money on paying demurrage. while the customers demanded a price reduction before they picked up.
But that is my guess - you should really ask your supplier for an explanation.