I am trying to manipulate a cube into a car; and I was able to make edge loops by pressing Ctrl+R. However, when I am trying to make a wheel well, I want to make new subdivision loops to do that; yet the old ones are getting in they way.
How do I remove subdivision loops so that I can manipulate my object without old loops effecting the new ones?
Or basically, the opposite of what Ctrl+R does?

I am trying to insert a wheel well into the front of the car. Now (this may be a bit hard to follow, but bare with me.) I want to insert the wheel well a bit underneath the hood (which is the left of the image. It may not be obvious considering my "skill level"), but the other cuts are making that quite a problem. How would I best remedy this issue?
– elemein Jul 24 '14 at 03:00