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Where is the setting for negative extrusion in Blender. In case I have the name wrong, this extrudes non-existence, ie you extrude back through an object to make a hole. I can make a pit (hole partway into material), but if I go through the other side it just starts to positive extrude from the back. I can't find the option to remove mesh and make holes.

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Maybe your question is not precise enough. For example you can make holes with booleans, or simply with W (Specials) > Bridge Edge Loops:

enter image description here

If you're looking for the same as the Push-Pull tool in Sketchup, it was an addon called Destructive Extrude in 2.7. It looks like it's not ready for 2.8 yet: https://blender.community/c/rightclickselect/Qlcbbc/

As explained in the video, once you've installed the addon, shortcut alt E.

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  • $\begingroup$ while that addon looks promising, there has to be a way to make holes natively. $\endgroup$ – Elliot Aug 18 '19 at 13:37
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    $\begingroup$ Ok I've edited my answer, maybe give an example of what you want $\endgroup$ – moonboots Aug 18 '19 at 13:53
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In edit mode, select the face that you want to make into a hole, and delete it (X). If you want the hole to have some depth, extrude the face down and then delete it.

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