Steel Girder with Variable Depth and Thickness - SSD


I am trying to simulate through SSD a steel girder that varies across the span of the bridge both in depth as well as thickness. (i.e. depth of girder at supports = 940mm and bottom flange thickness = 60mm and depth of girder at mid-span = 630mm and bottom flange thickness = 30mm)

The recommeneded way is through cardisian points and variables, however, I am only allowed to define one Cardisian point either for the thickness or the depth. I have also tried inputing at the same cartisian 2 pre-defined variables, however, i got a message saying that only the first will be read and the second will be ignored.

Is there any way I can overcome this ?

Many thanks,