B2B invoices means Business to Business Invoice. GSTIN of the sale made to Reg. person will be filed here.
B2C Small Invoices means Business to Small Customer Invoice. This includes
a. Unregistered Intrastate Sale(no amount constraint), and
b. Unregistered Interstate amount upto Rs. 2.5 Lacs.
B2C Large Invoice means Business to Large Customer Invoice. This includes Unregistered Interstate sale more than Rs. 2.50 Lacs.