In a few steps, learn how to set-up a catering handling fee product that can be sellable and billed from a request:
First, select 'Customer Placed Order' setting under FBO Settings > FBO Profile > Request (follow logging out instructions to activate all settings)
2. This enables a new setting called 'Charge Catering Handling Fee'
3. Make sure you have a 'Catering Handling Fee' sellable product in your Products & Services.
Note: If checkbox is selected then 'Catering Handling Fee' will apply by default from Catering billing to X-1 invoice (image below)
You may also leave check-box empty, then apply handling manually as it fits.