Hold Ctrl+Alt then click and drag the body part. Also hitting F4 toggles collision lines, so you can see where to click more easily. I think you might be able to script the replacement of a body with a skeleton, but it would not be in the same position, and probably end up looks really bad. The only way to do it well would be if the body and skeleton were 'unmovable' or something. But doing it to actual moving enemies will be impossible, at least to make the skeleton look like the body it replaces.
Hold Ctrl+Alt then click and drag the body part. Also hitting F4 toggles collision lines, so you can see where to click more easily. I think you might be able to script the replacement of a body with a skeleton, but it would not be in the same position, and probably end up looks really bad. The only way to do it well would be if the body and skeleton were 'unmovable' or something. But doing it to actual moving enemies will be impossible, at least to make the skeleton look like the body it replaces.
I have a dead body for the idea, but if its that complicated then forget it, it would be nice to just be able to replace the model of the person with a skeleton