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I often come into situations where I would need more geometry when modeling using subdivision surface. Maya has a tool for that. It works by adding edges by subdividing but still maintaining the form of the mesh. Here is a link showing how it works: https://www.youtube.com/watch?v=qVX_II7VQxI&t=130s

Here is a picture hopefully clearing my question:

enter image description here

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    $\begingroup$ ctrl + r??????? $\endgroup$ – 10 Replies Jan 6 '17 at 11:25
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    $\begingroup$ This: blender.stackexchange.com/questions/13545/… might also help $\endgroup$ – 10 Replies Jan 6 '17 at 11:27
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    $\begingroup$ I don't think this is a duplicate: the question isn't about how to add edge loops, but how to add them in a way that they don't change the surface when working with subsurf. Normally, edge loops with subsurf make the edges sharper which isn't always intended. (Note that the subsurf modifier is just an easy way to visualize the effect) $\endgroup$ – piegames Jan 6 '17 at 16:15
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    $\begingroup$ @Sensimas If the duplicate question isn't what you meant then you need to edit your question and add additional details to explain how your question differs. $\endgroup$ – Ray Mairlot Jan 6 '17 at 17:28
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    $\begingroup$ This is NOT duplicate, watch the video linked. $\endgroup$ – Rawcal Jan 6 '17 at 18:35
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I have not found any information on the web regarding that sort of tool in Blender therefore I conclude it does not exist. However I think the workaround might work in some situations depending on your needs. Here is what I used:

  • select your mesh
  • alt +c (convert to) -> mesh from curve/meta/subd/text
  • cleverly use the edges you need for your shape and remove the ones that does not affect it

Hope it helps.

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