Cutting from object...

 Hi to all.

 

If I have one object and on that object are 3 pictures, how can I cut one of them , I try the cut/paste but it does not work, also try crop but then I loose the other. I just want to copy one part of image and paste to another place or another open document..

I need something to select the part of the object then to cut that part and to paste it to another place..