How to cut the ceiling (see attached)?

[bim3d]

As shown in the attached file, I have this curved/slopped ceiling created as an IN-PLACE-SWEEP. How can I cut the extraneous portion off as bounded by the walls? I have tried all suggested methods by this forum, but not working. Can someone take a particular look of this case? Any advisement is greatly appreciated!

[Tom Dorner]

I took a quick stab at cutting the ceiling with voids. You need a void to cut each sweep and some require two along the sloping wall. The trick is to edit each sweep and then add the void and do the cut geometry picking the void and the sweep. Then finish that sweep and go onto the next.

When you edit the sweeps on the attached file you will see the voids I used.

[gibson.tim91884]

Edit the ceiling. Add void forms (extrusion at the vertical walls, sweep at the sloped wall). Use the Cut Geometry tool to make the voids cut the ceiling. The voids wouldn't cut the ceiling until I did this. I was able to make it work, but using R9.

I also modified the ceiling by combining all of the sweeps into one. Not sure if this makes a difference, except there are less "things" to deal with.

[bim3d]

Thanks to both Tom Dorner and Tim Gibson for replying.

After examining Tom's VOIDs in the attached work-fix and trying on my own, I realized that I did not give any OFFSETS or extra "depth" to my Void Extrusion. It seems that the "rule-of-thumb" is to give some offsets to the Void so that the Void would enclosed the cut-outs "GENEROUSLY".

I also tried combining the SWEEPs and VOIDs into one each as Tim suggested. It worked out nicely even in 8.1.