How do I stretch or shrink geometry in specific directions?
Go to “Geometry->copy/move” and select on the geometry. Click on “scale” and type in a scale factor in the X, Y, and Z directions separated by spaces. For example, 1 2 1 will scale a factor of 2 in the Y-direction. Be sure to choose the right point to scale about. About, “centroid” may be the best choice in many situations.