Often when you start a project you don't know what elevation (level) you will want project zero to be at. So you build your mesh to AHD & set your stories at what may be close to their final height, but the time often comes where you need to adjust the stories relative to the mesh. To keep the project zero story at zero you need to raise or lower the mesh. This however throws out the heights of the mesh relative to AHD. It would be great if you could just drag the stories up or down relative to the mesh, without losing project zero.
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