You can delete both body parts and morphs in a Poser library file. Each can be dangerous, depending on what is being removed. The weld, IK and parent/child lines can be effected when removing parts. Zeke will do his best to repair these lines, but sometimes he can get confused, especially with "end" parts such as fingers. If you have a lot of parts to remove, it is usually easier and safer to use the Create New File button to make an entire new library file. If you are working with body parts, there is a shortcut to removing "extras", the purple button above.

Clicking the Coordinate with OBJ button will change the window to look like this. In this case, the CR2 and the OBJ match, but if there are extra parts in the CR2, you can dump them by clicking the OK button.