change floor height

[bbxrider]

when I built the plan I didn't consider that about 1/2 of the house is a different floor level. the orig house is on raised foundation about 20" high off the the ground, yellow in pic, an addition was added on a slab ground level, green in pic.
I put in 2 raised floors in the addition so they would be same height as orig house raised foundation floor. I drew them as 20" high walls, blue in pic
now when I render 3d its all botched up with the raised floors like an island in an ocean.
see pic showing the different floor areas. the question is can I some how raise the floor height in the whole orig house, again yellow in pic, to the same height as the raised floor drawn as a wall, again blue in pic?
trying to avoid having to redraw the entire plan

https://photos.google.com/photo/AF1QipP ... shzhUNn9xS

[hansmex]

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H