This question already has an answer here:
How to make a loop cuts all around the object? I can select just one side and I need them all at the same time.
Here is what I need.
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marked as duplicate by cegaton Jan 29 at 3:34
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
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$\begingroup$ maybe my answer here will help: blender.stackexchange.com/questions/129731/… $\endgroup$ – moonboots Jan 24 at 15:20
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$\begingroup$ read also: blender.stackexchange.com/questions/33670/… $\endgroup$ – cegaton Jan 29 at 3:35
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If the mesh already is triangulated you could use the Knife tool (K) in Cut Through (Z) and Angle Constraint (C) Mode when you are in a side orthographical view. This will let you add edges regardless of the topology.
But most of the time it's better to just un-triangulate it manually by Dissolve edge or with Tris to Quads (Alt-J) in the face menu (CTRL-F).
If you have ngons you can find them with the Select All by Trait/Faces by Sides and set the number of vertices to Grater than 4.
You will find it much easier to work with quads.
