When your customer sends in some identification documents for both Mr and Mrs on the same page and these need to be attached to different requirements on the Task List, don't panic.
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Simply double click on the page you want to crop (in either the 1st or 2nd panel), and the image will open up like so:

You can then use the crop tool in the top right corner: 

To crop one of the licences out of the file and create a new file, you'll need to:
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Press Save and the new file will appear in the second panel, which you can then use to attach to a requirement:

And that's it, you're done cropping!