Hi, Brian,
If your sheet model is in the same design file as your 3D model, then associative dimensioning will work. There seems to be a problem with associative dimensioning working when the 3D model is in one DGN and the plan view of it is attached to a sheet model in a 2nd DGN. I will ask development to check into this.
Which scenario are you using?
Sincerely,
Steve Stevens Product Manager - Bentley Architecture.
Brian Thomas, AIA, LEED AP BD+C
GH2 Architects