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I think I understand your question ... and, if I do, I believe what you need to use is the "marquee tool". Use the rectangle marquee tool for square or rectangular shape openings, and the elliptical marquee tool for circle or oval openings. If you want to set the opening size to something specific, once you select the marquee tool, set the "mode" to "fixed aspect ratio" and then enter the desired dimensions.
Hope that helps!
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