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Hey there, cottonlaw2016cal.
Right now adding cost to your customers isn't possible. You can only input a cost when you set up your inventory items, billable expenses, and when services are purchased or provided by vendors.
If you're trying to enter a cost to your items, here's how:
You can learn more about tracking and managing your inventories in the following articles below:
Also, these resources are good references in modifying customer's profiles:
If you're referring to something else, please let me know. I'm always here to help and provide additional assistance. Keep safe and have a good one.