Create Interface With JME

I am new to JMonkey and I want to create a application for accident simulation system. I want to drag and drop objects from toolbar into a work area. there will be buttons, menus, and other user interface items. I want to know is it possible to do that and if so how to do that… please give me a rough idea about that. also any sites to refer.

First I suggest you first get familiar with jME by reading the tutorials/user guide:

A good example of a GUI application for jME would be the RenParticleEditor (included in the build at jmetest.effects.RenParticleEditor).