put https://api.apicbase.com/api/v2/inventory/outlets//count_events//partials//set_single_item/
Counts a stock item in a sub-count.
This action counts a single stock item in a sub-count. If the item hadn't been counted, it adds a new entry to the sub-count. If it had already been counted, it will overwrite the previous counted quantity.
Setting quantity to null will remove the stock item from the sub-count.