I created the item in 3ds max8, then I followed the tutorial "http://cs.elderscrolls.com/constwiki/index.php/From_3dsmax_to_Oblivion_CS" to transform it into a nif. Well, Actually when I tried to save it with collision it crashed 3dmax, so, I managed to save it without the collision.
So, I picked the tutorial "http://www.lkmac.com/xiamara/HavokCopyTut_p4.htm", "Simple Havok Copying for Your Clutter/Miscellaneous Objects", I managed to follow the steps to add a colision and everything in Nifscope.
But, when I create a new static item with this nif file and I place it in CS, the CS simply crashes.
Anyone can give me a hint? or point other tutorials about this kind of subject?