Qty Pricing is a feature you turn on to add quantity price breaks on sales transactions. An Order for 20 units of an item might be regular price while 100 gets a special price.
Qty Pricing is a complete feature set you turn on to enable:
Qty Pricng tab on the Item card for entering Qty's and their Prices
Import and Export options for bulk updates to Qty Pricing
Qty Group for counting across grouped items to determine pricing