Start with the last three months of orders You can't manage supply costs from a single invoice. Review at least three months of order history and group purchases by category, department, and location.Look for repeat orders placed a few days apart, several versions of the same item, rush shipments, and products that appear on invoices but not in storage. These patterns show where money slips through the process.Build a short list of questions for each high-use item:• How often do [...]