You might also consider setting correct options on your drafting views so that they are locked, and do not update when the model updates. This is called a "snapshot" view. The benefit with this approach is that you can always "unlock" the view and update it in the future if you need to. Here's a link to a topic in the Help collection that describes the different settings for locking a view, and here's another link that shows you how to apply the settings to a drafting view.
Any specific reason to create such non associative drawing?
As @DEckhoff mentioned, use of 'Locking Views' will be the simplest way. Please note that this locking views functionality was introduced in NX 11.0.1 release. Some more details will be good enough to help you with respect to NX9.