I use the slide tool. Then after slicing my image, I press the control key and click the image and name it. Then when I go to save for web and devices, you click the save button, ps has the File Name, Save as type, settings, and slices drop down menu in the Save Optimized As window. If you set the slices menu to “All User Slices” it will only save the images you named, you also have the option to save only the selected slices. I like the slices tool. If used correctly, it can save time.