For some reason, MAC OS X Lion and Mountain Lion removed Save As in most of the apps. Here is a quick guide to get it back.
System Preferences » Keyboard » Keyboard Shortcuts and selected “All Applications” on the right side. Then I clicked the plus-sign under the right column and added “Save As…” for the menu. Note that both “Save” and “As” must be capitalized, and you must use a proper ellipsis character (…) at the end. Select a key pad combo such as Command, Shift, S