There are also some other "low level" editing that you can do by breaking your solid into individual surfaces and operating at a surface level rather than on the joined solid.

For surfaces you can turn on control points and move the surface control points around, and also you can select trim curves that are not joined to other pieces and delete them to recover the underlying surface in those areas, that can be useful sometimes to erase a hole if you wanted to make a new hole in a different spot.

There is a tutorial on some of these techniques here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=446.17
But they are kind of more advanced techniques.



Also if you want to make changes it's not unusual to just delete some piece of the model and build a new fresh surface in there and then proceed from there.

One thing that is a lot different with NURBS than polygons is that you can make some big pieces of a model really quite quickly - so often times the solution is to just build a new portion of the model to replace the old one, rather than focusing on vertex tweaking of what you currently have.


Please do post your model along with your question though, it helps a lot to focus on a specific model when giving advice.


- Michael