I'll be glad to help you track your Expenses.
To begin with, may I ask if you're trying to run an expense by the supplier? If so, we can run an Expense by Supplier Summary report.
Here's how:
You can check this article to learn how to customize your reports: Customise reports in QuickBooks Online.
On the other hand, are you also trying to add a Cost Center in QuickBooks? If so, please know that this is currently unavailable. However, the system includes a project feature that allows you to track or quickly calculate your costs.
For further reference, please check out this article: Track hourly labour costs and profitability by project in QuickBooks Online.
Moreover, please let me know if you're trying to achieve something else or have a different concern.
Let me know if you have further concerns about generating expenses or any QuickBooks-related queries. Keep safe.
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