Surface cannot split part

gauthier_östervall

I have a surface that is wider and deeper than a part, yet cannot split it. What prevents it?





I suppose that the issue is related to the half visible edges that show up here:





Here is the project, the yellow part's creation and split are at the end.

I was under the impression that if the splitting surface "covered" the part to be split, everything would be alright. Even if the split would split into more than two parts, which I think might be a possibility here.

alnis

I wasn't able to get the split working, but I was able to get an extrude up to part/surface to work (which seems to give the geometry you're looking for):
https://cad.onshape.com/documents/d411ab29a4ba1e3d2c855866/w/df40145ef2c41d34ac5049e7/e/05e9e5efba365c877a0b14cc


Screen recording tutorial:
https://youtu.be/NIV-aoVAFtY