Be able to select the order services appear in the list when users create a new appointment

ADMINISTRATION:

In the section Services / Combos of ADMINISTRATION, admins would like to be able to select the order the services appear in the list when users create a new appointment in CALENDAR.

Example:

They want to put "Suivi - 30min" as the the first option they see in every calendar and "Sx Grippe - 15min" as the second potion during the cold seasons.