Lightroom: How do I crop to a specific size in Lightroom?

I love Lightroom, but I am having to size all my pictures from a photo session at 11x14, and as far as I can tell there is no way to crop a certain size in lightroom. So I am having to work in lightroom and then save and then crop it in Photoshop which messes with the pic. Is there anyway to crop pictures to a certain size in Lightroom?
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