With the Suppliers module, each ingredient can hold several Supplier IDs rows, one per supplier you buy it from: the Supplier, the supplier's Item ID (SKU on their invoice), the COGS ($) you pay for a pack and the Total QTY of base units in that pack. Click the + icon to add a row and the trash icon to remove one. Sprwt uses these rows to (1) auto-fill Ingredients COGS per Qty = COGS / Total QTY for the Supplier Default, (2) match receipt lines during Import Supplier Receipts with AI by Item ID, and (3) preview and save the new price when you change a supplier from the Inventory Shopping List report.