Hello Kulfi,
i don't know if AUD knows if the cable is round or not, but to tell you the truth i have never seen an electric cable or wire that wasn't round. as far as the eveleation you can set that manually by changing the Z value, but i dont know if AUD has a setting for elevation of underground cables (at least i haven't seen one) if there was a setting i would think it would have to be in the industry model on every cable as you could have different depth\elevation for each type (secondary, 200 amp primary and 600 amp feeder) of cable because at least here in the US they have different required minimum depths.
Jim