In WriteUpp you can add up to 3 of your custom fields to your invoices. Just follow the steps below!

Create your custom fields that will appear on the client summary (if you haven't already done so) -> How do I create my own custom fields in the client summary?

Go to Settings -> Invoice and click on the Layout tab

Select which custom fields you would like to appear on your invoice using each dropdown. If you only need 1 or 2, leave the others set to not shown:

Click Save

Your custom fields will appear on your invoice here:

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