How to add formula in custom field


We have a surcharge field in invoices called service charges. We need to add a formula for this field. Like it should show 10% of the sub-total. How do I do it?


It isn’t currently supported. One possible workaround may be to apply a negative discount and then set a custom label for “discount” but it would need to be tested.

Feel free to create an issue to request the feature:

Hi Hillel,

Thanks for your suggestion. Is there a way to remove the negative symbol (-) from the result?

Sorry, not that I’m aware of.