Possibilities of conversion entities and coicidence and other relations on VUE en SECTION

Hello
I would like to know how to hang on to a volume with a CROSS-sectional VIEW shot chosen in the right place, am I clear? Maybe there is another way?
Once the cross-sectional view is done, I can't convert the edges even with a 3d sketch.
cf attached image, cordially, thank you in advance

I found a solution with the split tool, is there another solution? Too bad that with the section view tool you can't " retrieve/convert " the entities on this section plane.

Now I can't combine the volumes, the part is not finished but I will be forced to do it for leaves and plastic 3d printing, attached is the sw 2020 file
Thanks
headlight crankcase. SLDPRT (260.9 KB)

I assume you are making the sketch in the outline that you have created.
In sketching, you have to choose " intersection curve":
image

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Quite simply, thank you!!