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I want to cut out the shapes seen in the background of the image below, onto the plane:

enter image description here

I want to do it symmetrically, preferably using the knife tool. The mirror modifier won't work here; I only want symmetry on a specific face, or specific faces, of the object that I'm currently modifying in edit mode. I have already tried using "X mirror" in edit mode options. How can I accomplish a result like this?:

enter image description here

Note: I already am using mirror:

enter image description here

If I can't symmetrically use knife, then I want to do this: enter image description here

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    $\begingroup$ This can be done with Mirror modifier; you just should decide what to model and what to mirror $\endgroup$ – Mr Zak Mar 23 '17 at 21:46
  • $\begingroup$ @Mr Zak this is nothing more than a face on a mesh, sure you could do it with an entirely different object, but how would I apply this to a specific face on a mesh? $\endgroup$ – Accumulator Mar 23 '17 at 21:55
  • $\begingroup$ What does your question mean? There's no difference if it's another object or the same one; from your starting face (which should be split to more faces) extrude faces serving as panels according to the reference, set the origin point and mirror. $\endgroup$ – Mr Zak Mar 23 '17 at 22:08
  • $\begingroup$ @Mr Zak I am already using a mirror modifier on one side of the object. It would effect the other modifier if I added another. Either way where should I put the origin exactly? On the middle edge of the split face? $\endgroup$ – Accumulator Mar 23 '17 at 22:33
  • $\begingroup$ Your situation is not clear. If you mean that the right side on the image shouldn't be affected by the Mirror modifier mirroring geometry on the left side where 2 faces are added then separate objects, mirror as needed; you'll join them later. Origin point should be put where center of the mirror will be. $\endgroup$ – Mr Zak Mar 23 '17 at 22:42

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