You can add a new booking field under your “Set Up” page, choose on the “Customize Booking Fields”:

You are then able to manage the current the booking field/s on your account, where you can click on the "advanced options" against the booking field:

 This would allow to select or deselect the service this field needs to reflect in:

Make sure to scroll up to click on "Save Custom Fields" to save any changes made:

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