How do I see the "cost" of my part on my invoice?

Hello, 524771001615313.

I'll show the steps where you can find the cost.

You can open the product or service to see the details of the cost.

Here's how:

1. Go to Sales > Products and services.
2. Select the Edit link of the item you added on the invoice.
3. Scroll down to the Purchasing information section and you'll find the Cost.

Please take note that the system will only apply the cost to the expense transactions. The rate used on sales is based on the Sales price/rate you set up.

To help manage your products and services, please feel free to check out this article: Add product and service items to QuickBooks Online.

For any additional questions or if you need help with other task in QuickBooks, feel free to leave a reply below. I'm always around to help. Take care and stay safe.