while I am trying to show grid in section iface this massage
"the grid system for drawing "untitled.dgn" was not found"
Perhaps you can post the files?
regards / Thomas Voghera
You also need to attach associated floor manager file.
I believe when a grid system is created it writes association
information back to floors defined in your floor manager file.
here is th efile manager
this building is ss100
It appears that your grid doesn't line up with your building.
When you manually referenced grid into 3d model it was moved to align with your building.
Try Aligning generated grids with model using the x and y offsets in grid tool. Then update grids.
See attachments
I think Tom has nailed this one - the grid model referenced into the 3D model has been offset to line up with the geometry, so the Grid itself also needs to be offset to match up with the drawing.