Guess I misunderstood the question in your previous post.

Apparently you are asking about 'boarding bridges', aka 'jetways'.  Afcad can not place jetways or any other scenery objects.

To do that requires using a scenery design/placement program(like Airport or FSSC).  Check out the 'Scenery & Panel Design' forum.

A few  default airports already have jetways, major airports like KLAX, KDEN,  etc.  To see these jetways the Options>Settings>Display>Scenery Tab>Scenery Complexity must be set to Very Dense or greater.

Dave