Slab was created and block drawn on the surface to create a hole of the block shape through the solid.
Tool: Delete Solid Entity (mode: face) – the block shaped hole cannot be deletedIn the case of cylindrical hole it works fine (instead of block, a circle is used as a curve to cut the solid).
To delete the hole and make the solid full slab again: Delete Solid Entity > every surface out of four surfaces needs to be selected while holding CTRL-key and view needs to be rotated to be able to click on some of the surfaces of the hole.
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