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Below is a picture of a rally car part for protecting an area of its suspension.  The picture was taken with the part sitting on a cardboard box, and I am trying to remove the cardboard from all the inner elements.  (please no comments about the part being on a cardboard box, this has already been mentioned to the photographer....)

The remove background tools are not working well for me, so I was creating paths, making a selection and then clearing the background.  There are many identical areas within the image where the background is to be removed, but I have no idea how to go about this repetitive task.

As you can see in the image attached I have cut the image out, and also cut out one of the sections.  Now I am stuck...

Should I be making a clipping mask and copying my selections somehow?