A partial inventory session is an inventory entry that only accounts for a portion of a full inventory. Inventory counts for the adjusted items will updated, but the a partial session is not used in inventory reports.
A partial inventory session may be used when spot checking inventory counts, or checking inventory totals while building vendor orders. A partial inventory session is not used in reports like a full inventory session. You must select to save a session as a partial inventory in order for it to be recorded.