I'm not sure I understand what you're asking, but if I'm cutting an entire piece of CS on the diagonal, I just use an 18" drafter's ruler (the metal kind with the cork on the back to prevent slippage) and a hobby blade or rotary cutter.
If it's just a small, regular sized piece, I use my Fiskars trimmer, which has interchangeable 'plates' that fit over the cutting surface with diagonal guides. Otherwise I just eyeball it. LOL ;) HTH. Sorry if this isn't the info you're looking for!
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