I have being trying to get Swissport to work at UK2000 Leeds. I have edited the afcad for the scenery and added the appropriate codes for swissport. For example i load gsx up and despite my afcad changes and the changes using the GSX tool in p3d it still gives me Jet and BMI. BMI have nothing to do with Leeds Bradford what so ever?
You are making a lot of work for nothing. The current GSX version have the ability to set an operator WITHOUT touching the scenery AFCAD, by simply adding it your preferred operator in the "airline codes" field in the parking customization dialog.
Of course, I assume you ARE using the *current* GSX version, otherwise the option won't be there, since it has been added fairly recently.
As well as that some gates it just chooses random airlines for example China Airlines handling? I don't understand and i have tried everything.
If it happens at some gates only, it's possible the scenery designer has flagged some non-cargo parking as cargo, so if you go there with a non-cargo airplane, GSX won't know what to do. Which is why, the current version lets you override the parking type too.