Under the Add-Ons tab, click on the pencil icon next to the add-on you want to connect to a ledger.

Assign the add-on to the correct ledger account by clicking on the dropdown menu.

Choose
Accommodation Rev
Beverage
Bicycle
Cat walking
Dog walking
Food
Horse riding
Misc
Transport
VAT High
VAT Low

If you have already set up a revenue group, you are able to add it to the add-on.

Choose
Bar
Breakfast
Crib
Massage
Mini Bars
Miscellaneous
Restaurant

How to add a ledger to your add-on?