By supporting services, I mean things like...
- make up for modes/talents/people for photo shoot
- helping photographer/videographer to carry their accessories/equipments & setup or looking after of equipments
- service to cut and paste photos into albums for the photographers after their photo shoot jobs.
- pickup and ferry photographers/videographers to their shooting locations and back
(list is just some examples...)
Basically, doing things that are not really photography/videography itself...but to support the photographer/videographer in their work.