Hi,
Walls, most of the time, are drawn using those two constrains, right now wall by curve has only base and height. Would be great to add a new input for top.
Thank you!
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Hello!
Until this feature is added, I use this workaround. You just need to set the Parameter Key to: Annotation:Level:Elevation, hope this helps. 
Hi @omar.mowafy,
This is not really about the geometry. It’s more about the IFC data let’s say. When you have to specify that a particular wall has a top constrain.
Then let’s hope it’s added soon, or maybe both you and I are missing something. I will let you know if I learn something new, as I am still exploring the tool also.
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Added an issue related to this