The second tutorial requires a 'knife' or cutting tool, so you can do those cutting across things, I would assume AC3D would have this feature as practically every good 3D app has this, I know Anim8or has it for certain, you could download it just for this tutorial, but I wouldn't recommend to keep and switching between apps to use specific functions though, if you don't have a knife tool, there is always a way round.
For example, it is slower, but instead of making a cube and using the knife tool, but make the cylinder from scratch with a polygon and the edge extrude technique, that way you get the same result.
It's true what they say, if there's a will there's a way.
Thanks for the comments and looking at my tutorials, I hope they are helpful.
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