Auto-update Category on an expense when 'Billable' ticked

Auto-update Category on an expense when 'Billable' ticked

I want to be able to auto-update the Category on an Expense if the field 'Billable' has been ticked and possibly also have a pop-up box letting the user know that has been done so they can accept or decline to change.

Does anyone know how to do this?

The Workflows / Field update areas in the App only let you control Reports and not individual expenses as far as I can see.

Thanks

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