Croping in MoI???

 From:  Pozero
Hi everyone. I am new in 3D modeling and learning to work in POSER 7. I discovered MoI two days ago and I am impresed. Beautiful interface and very powerfull tools. My question is HOW TO CROP MODELED SHAPES ? I want to cut off some unnecessary parts and I don't knw how. I tried out TRIM tool but didn't make to do this ?