I am really new to Blender, so please bear with me here. I was trying to make a Starbucks cup, so I needed to get a round-edged plane (for the middle part of the cup). I got help from a friend, who told me to subdivide the plane, then use a subsurf modifier to create the rounded edges. All is good and fine on 2D, but when I extrude to create the height of the cup, I get this weird thing:
I think this is because the subdivision surface is being applied to the z-axis too, but I don't really want that. Can I apply the sub surf to the x and y without affecting the z? Again, please excuse my ignorance. Any help would be appreciated.