parking lot & dtm

[digitalcarbon]

i have a parking lot that is an odd shape. it has smaller lots connected to it by small branch roads and a road that is a passenger drop off zone. i would like to keep it all one piece. each area may slope different from another area. it also has islands of plantings in various places. how do i show it on my dtm?

i have the polygon all done.

[islandmon]

The way I've always done it:

1) Site Modifier(s) to grade Existing DTM

2) Place 3d Loci all over the place and then adjust a 3d poly>NURB Surface to match using Lofting, as req. for slab thickness

but, since i've not yet update to 12.5.1 ( soon come ) there's probably an easier method ; )