Unit costs, per product
The product cost list is the accurate route: what each product cost you to buy. This is the biggest of the expense lists and the one that decides whether gross profit can be stated at all. Every entry ever recorded stays visible, superseded ones included. That is deliberate — the question an operator brings here is as often “what were we paying in March” as “what are we paying now”, and a list that only showed current prices could not answer the first.A declared rate, as an escape hatch
For orders nothing can itemise, you can declare a flat COGS rate instead. Nothing on that screen is ever prefilled, on purpose. A rate you state is data you own; a rate Soran guessed for you would be a guess wearing a decimal point.Related
Product catalog
The products costs attach to.
Expenses and profit
The other three kinds of cost.