Thanks for the comments guys, I really appreciate the fast responses.
Barry: we understand the use of layers and turning them on/off to show or hide elements when needed etc. The reason we are using worksheets is that in this type of project there are different types of units adjacent to each other that need to be dimensioned and notated separately. And by using the Worksheet selection marquee we can confine the area we need to notate.
As walls/floors/library objects in all units are on the same layers, it is impossible to turn off the adjacent units.
Basically by using the Worksheet method it allows us the space around the individual units to notate as needed.
Erwin: I am not a fan of the layover method, and I am not sure that this way would keep the dimensions 'live' to the plan.
See attached image showing the Floor Plan Window and the locations of the Elevation and Section Marker Heads, below that the Worksheet as a direct selection of the Floor Plan and notice how the marker heads have repositioned themselves. This repositioning occurs every time we Rebuild From Source.
Everything else within the Worksheet selection stays in its correct place, and the dimensions come in from the Floor Plan and stay live, it is only the marker heads that reposition.
Thanks,
Mike