Hello there, @I360.
Thank you for reaching out to us here on the Community page. I'm glad to share with you some insights about matching expenses to invoices.
Usually, you can mark an expense as billable to a customer/job. Since you don't want to add the expenses on your invoices, you can manually add notes/descriptions when recording transactions for identification purposes.
When recording an invoice, you can as well input the notes under the Description column.
To learn more about invoices and tracking expenses for a particular job, you can check out these links:
You can as well read the topics from our help articles for additional guides while managing your income and expenses.
Please feel free to leave a comment below if you have any other questions. I'm more than happy to help. Wishing you and your business continued success!