If you want to add additional fees & services to your Bookable Service, you can create Add Ons.
Go to your dashboard and click on Total Bookable Service.
You will see a list of your existing Bookable Services. Click on Manage Add Ons next to the one you want to manage.
To create a new Add On, click on the green + button in the top right.
Complete the details of your Add On, for example:
Title: Additional Horse
Description: Add more horses to your session
Image: Choose file (JPEG / PNG)
Limit: 3 (max. horses per session)
And then click Save.
You will now see your Add On has been applied to your Bookable Service.
From here, you can Edit or Delete your Add On using the action buttons next to it. Or create another Add On by clicking on the green + button in the top right.