This function was possible in FSX/P3D ONLY because of SODE, so we could have:
- multiple jetways (not possible in MSFS)
- decide which door a jetway should try to dock with.
In MSFS, since there's no SODE, everything related to jetways, how they work, and how they interact with the airplane, is completely controlled by the simulator and the airplane itself: the one and only thing GSX controls about Jetways in MSFS is how they LOOK and ONLY at Default airports where you enabled GSX jetway replacement files (which should always disabled on non-Default airports).
This means, in MSFS:
- The airplane developer decides which doors can accept jetways. Nothing in GSX can change that.
- The airport developer controls how jetways are positioned, and if they have custom jetways, their modeling also affects how they work (or not), together with the positioning. Nothing in GSX can change that.
- Where you parked affects how jetway works (or not) AND even which door (of the available ones modeled in the airplane) is used, because MSFS itself decides which door the jetway should dock to, using its own strategy, which doesn't differentiate what doors are used for so, in some situations, you might even see the jetway docking on the Catering doors, with some combination of airplane positioning and jetway positioning in the scenery. That's how MSFS works, and nothing in GSX can change that.
The one and only way for GSX to have SOME control over jetways (in an indirect way), is setting a custom STOP position with an airport profile so, assuming the position has been set sensibly, and you respect it when you park the airplane (that is, you follow GSX own marshaller or VGDS indications), you might obtain the result you are expecting.
So, for example, you might be able to achieve this by setting the Stop position in a way that, on a parking spot for Heavies, it would result in the jetway docking only on the 2nd Exit, but not on the 1st one. That's why the parking editor has a "Test" function (NumPad + 5 when editing the Stop position), which can be useful when customizing the Stop position.
In addition to that, using Python-based customization, profiles can even make specific rules for selected airplane models, by creating custom Stop positions that are related to airplane, instead of using the default strategy of "always use the preferred exit in the same place". which is what GSX normally use to handle different airplane type parking at different positions.