Crop

Cropping cuts away rectangular areas on an image without affecting the resolution or dimension of the area that remains.

To crop an image:
Select image object.
Select Crop from menu Effects
Draw rectangle inside the image.

You can Restore the original image by clicking Restore Original in menu Effects.

If you resize the cropped image, the original image will be restored.
If you are satisfied with your new image then you can apply ½Make new original╗ from menu Effects. After that you can resize the new, cropped image like it was the original image.