can i ask, why there is only one cargo stuck work and one catering work
This sentence is not very clear. There are two cargo loaders and two catering trucks. HOWEVER, on SOME planes, we configured them to have just one, because the plane service and cargo door's are simply too close together, so both vehicles simply won't fit. For example, the Aerosoft A318.
The aerobridge doesnt work.
If with "aerobridge", you mean the jetway, as explained many times already (too many times to count, really, there's even a blue highlight on the manual), GSX doesn't control, doesn't affect, doesn't change, is not affected by, anything related to jetways.
They continue to work (or not) as they always did. Installing GSX won't change anything about how jetways operate. The only form of interaction, is that GSX can detect if a native FSX jetway is present on a given parking, by looking at the scenery AFCAD, or it can customized by you, to indicate which parking spots have jetways, if you use a scenery with static jetways which can't be detected automatically.