A line item is a line of an order that represents an order for one ad to show (An order may have several ad)
It describes a set of requirements for an ad to be selected in order to show.
The line item type Sponsorship, network, and House are percentage-based goals whereas the other ar quantity based
Advertising - Header Bidding (Advance or Pre-bidding) with a:
Total: 1000 x 10 x 5 = 50,000 line items and creatives