This is how you can add add-ons to a reservation in the OnRes system.

Go to the Reservation Manager, open a reservation you want to add add-ons to, which will open a Reservation Details window.

Open the Reservation Details window and click on the Add-Ons Tab. Choose the quantity for the items you would like to add into the reservation. The cost is calculated on the fly and reflected in the right side Summary table.

If you would like to add an add-on item on the fly, click on the ‘New Add-on Item’ action link to open the Add-on Details window and create the item.