Adobe CC 2014 (Cloud Subscriber Version)1. Create a layer and put a filled rectangle in it2. Use the marquee selection and select the rectangle3. Hold Alt and Subtract a portion of the selection4. Press V to move the selection upwards5. Press M to go back to Marquee6. Hold Alt to Subtract another portionWhat ends up happening for me is the subtracted selection also deletes the rectangle. This is not how it is supposed to work. It is only supposed to subtract the selection.