Custom fields can be added to your invoice's field data. To add a custom field, click the Add Custom Field button. In the Custom Field dialog enter a name for the custom field and specify the data type it should be from the Data Type drop down. Indicate whether it is a required field by selecting the Required Field checkbox. Choosing to make a custom field a required field means that field must have a value in order for the invoice to be validated.

To remove a custom field, select the custom field to remove and click the Remove Custom Field button.