Problem with triangle void cut and smart assembly

[juha.kalli3KFVA]

Hi all

I have now big problem. In our company we use Agacad's tools and Revit in elements planning. I want that in bottom side of the wall is connection cut, where lower elements connection rod coming. Just like in the picture. Here is the problem: if i make just normal 150*150*150mm rectangular void family, then i make assembly with Smart Assembly tools, cut get dimension perfect. But, because the work safety, we want that profile in the top of the cut is triangle. 

Now Smart Asembly doesn't recognised that this is a nonstandard cut. 

We not are spend yet our free training hours with Agacad, but i asked first there. Do your have any solutions? Of course we can make separately detail, but its would be nice if we can make this in element. 

[Ahmed_Muharram · Accepted solution]

check this https://youtu.be/fzTllh2XCI8 

[juha.kalli3KFVA · Accepted solution]

Solved. I did this just two reference plane both side of the cut and then set dimension from right and left reference plane in smartdimension.