FSSC - Creating elevated objects

Hi All
I have an airport terminal that I have designed with FSSC. I want to add some elevated passenger bridges from a parking garage to the terminal. I've played around with the "alt" entry but everything I construct wants to stay at ground level. Is there no way of making elevated objects with this program?
Thanks Snowgoose
I have an airport terminal that I have designed with FSSC. I want to add some elevated passenger bridges from a parking garage to the terminal. I've played around with the "alt" entry but everything I construct wants to stay at ground level. Is there no way of making elevated objects with this program?
Thanks Snowgoose