The following article explains how to attach a Guest Service to a Client Type, so that it is appended to every booking made using that Client Type.
Removing a Guest Service
To remove a Guest Service from a Client Type, select the Guest Service under the Attached Services column and use the arrow pointing to the right to move the service to the Available Services column. Select Post to save.
NOTE: When removing a Guest Service from a Client Type, it does not remove the Guest Service from any EXISTING reservations. If necessary, this would need to be done manually on each reservation.