If you're a developer and want to make a custom stock rule without customer support, this article will help you achieve that goal. Otherwise, please refer to these articles instead.

Rules are evaluated using a strict subset of javascript.

free: Net available stock (on_hand - reserved).
​on_hand: Current physical stock.
​reserved: Stock reserved for open orders.
​fba: FBA inventory.
​skip: Do not push quantities to this listing.
​store_default: Use the store's configured stock rule.

Never advertise more than this much inventory as available. Great to fight competitor's repricing tools or to stay under eBay's item limit. Note: This will toggle between being a unit off to ensure stock sync sees a valid change in stock to push regularly.

no_more_than(free, 10)

Never advertise LESS than this much inventory as available. Directly permit overselling. Note: This will toggle between being a unit off to ensure stock sync sees a valid change in stock to push regularly.

no_less_than(free, 100)

Starting with the "start" value only provide rough figures for actual availability. e.g. 50, 100, 200, 400, 1000, 2000, 10000, 20000.

snapping(free, 50)

Include incoming inventory from POs due within a set number of days. The number of days due can be adjusted higher or lower as desired. This example rule includes incoming stock from POs due within the next 30 days:

free + incoming_due_by(30)

Split stock levels across multiple listings. Prevents advertising 100% of stock for items listed multiple times. Note: This function is typically applied to a store's stock rule. If only targeting a single item to divide stock, then apply the rule to each listing linked to that item.

Structure:

divide_across_listings(stock_rule, num_unique_listings, multiplier, fixed_reserve)

Basic usage:

divide_across_listings(free, num_unique_listings)

Advanced usage:

divide_across_listings(free, num_unique_listings, 0.90, 5)