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CUTTING hole in side dome

hi to all the greta team here
very stupid issue however…
i made this dome and trying to make a cut hole however no matter what i tired it does not cut… any reason where i am wrong?
https://cad.onshape.com/documents/ab4f885358b9b453bf0dfe60/w/3bbcd980fb98ed7db1160ffd/e/2717e5503b7184b9370b8aaf
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Looks like you're trying to cut a surface with a solid? That won't work.
either make the dome solid (using thicken?) or make a surface extrude and split the dome surface.
but if I look at the whole objective of designing a suction cup, probably I'd opt for drawing the section in one sketch and revolving it.
You can use your extrude, just change it to a new surface. then use it to split the dome and remove the hole.