Hi, skspencer1516. To make sure that the equipment you buy and subsequently invoice for your client's reimbursement doesn’t incorrectly inflate your profits, you should set it up as a billable expense without adding any mark up.
Create a specific category to track the equipment and mark it as billable. Please ensure to reach out to your account since you're not sure what expense account you're referring
I included this article for you to check to learn more about how to organize your products and services in QuickBooks Online: Group products and services into different categories in QuickBooks Online.
If you want to import products and services into QuickBooks Online, check out this article. It guides you on how to upload a list from Excel, CSV, or Google Sheets into QuickBooks Online: Import products and services into QuickBooks Online.
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Your attention to detail and commitment to accurate records is impressive. If you have more questions about reimbursement expenses or anything else, feel free to reply below. Best wishes!