what is the difference between "Master bill of lading" and "House bill of lading"?

Answer 1

I would think the "house BOL" is used internally, through the logistical lanes of the company/shipper, and a copy of that is used as a packing slip, then once the order is complete, a MBOL is printed, and is the final official BOL.

EDITED TO ADD:
It looks like a "House BOL" has to do with exporting goods through brokers, I can't find a solid definition yet :(