Is there a way to dimension 3d elements on a single plane

Hello all,

I was wondering if there is a way to dimension 3d elements to a 0.00 z value or a single plane? I came across some detail sheets that were done in 3d (why I don't know). And whoever did this started to move reference files up and down in the z axis because there is no "priority" choice in 3d files. So now when we try and dimension nothing is good. We dimension from -1000 to 1000 at what looks like 12' line and the result is obviously wrong.

The question is "Is there a way to dimension elements with different z values using 1 z value, say 0.000"

Thank you