Inventory settings
Stock warnings, special-order handlers, head-office behaviour and purchasing defaults (cost method, over-receipts, PO numbers).
Inventory settings open from the gear beside the module title in the top bar — the same spot in every module — or directly at /suite#inventory/settings. They cover stock warnings, special-order handling, label-printing defaults and head-office behaviour.
The Purchasing section holds the purchase-order defaults: how a product's cost is updated on receipt (weighted average or last cost), what happens when more arrives than was ordered, the PO number prefix, whether labels are offered after receiving, and whether you are copied on emailed orders. See Receiving stock and Purchase orders.
The low-stock threshold that drives warnings is held per product per store — see Low-stock thresholds.