Dropping floor inside foundation walls semi split level plan

[GSCDesign]

Drawing a plan with one car garage on left side house on right side is 2 stories.  top of garage concrete walls and slab will sit about 4' above the first floor of house section on right.  Tall concrete wall that separates the 2 structures will be 7' and match the height of garage stem wall.  other 3 walls on right side of house will be 3' with the floor hanging off of that.  The floor would hang off of bolted ledger off the middle separating wall.  I have tried everything and I can't get the floor to sit down inside that tall wall, it just keeps wanting to hang off the tall separating wall.  I have tried dropping floor heights and everything.  I was able to manually adjust the concrete walls but cannot get the framing to cooperate.  Anyone that could help would be really wonderful.

[JiAngelo]

A cross section would be nice.  But from what is described you have a balloon framing situation.  A floor above and below but instead of joists resting on a lower wall, you want it to balloon past the floor and make both the upper and lower walls framed as one.  It is still two floors.  Open the structure dbx and you will find options to change the framing methods.