Sorry, I misunderstood your question, I thought it was about the Fills.
It would be good thing to know your ARCHICAD version because one method I want to suggest work only in AC22 and later. Would be a good idea to create a Signature in your Profile that displays this info for reference.
So actually you want to place "Level Dimensions" on your elevations, where your closes vertical Wall surface is "0,00", and Walls that are set back at certain distances from this Wall are marked with these "Level Dimensions" and they show the distance of their setback.
Yeah, so the basic problem is that you cannot place a Level Dimension in an Elevation (or as Barry said, you can place it ONLY in Floor Plan).
So you will have to substitute it with something else. I don't know if any automatic way of doing (maybe using Grasshopper, but I am not sure).
I would do one if 3 things:
1. Draw the Level Dimension Marker using Lines and Fills and Place a Text Block for the Dimension value. I would then group them and place them as many times as needed. In each instance you would have to edit the Text Block to make sure it displays the desired value. You would have to measure the value in Floor Plan.
2. Similar to Method 1, above, with the exception that I would save this as a GDL Object, then modify the 2D Script of the object to display in a Text Block the value of a text parameter. This text parameter would contain the Wall Depth value. Then I would place instances of this GDL Object and I would only have to modify the value of the parameter in each instance to display the correct Wall Depth value.
3. (this works in AC22 and later) I would create a "Wall Depth" Property, make it available for Walls. Then I would draw the Level Dimension Marker, like in Method 1, then place a Text Block, and within this Text Block, display the value of this "Wall Depth" Property using Autotext. Then I would save it as a Label using the "File > Libraries & Objects > Save Selection As > Label" menu command. Then I would use the Label Tool to place this as an Associative Label by click on various Walls in the Elevation. then I would simply have to fill out the value of the "Wall Depth" Property for those associated Walls. The Label will display the value of that Property.
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