It looks like you are using TurboTax Desktop. If so, you can do what you are asking. Create a duplicate of your tax return. Open your return, and click on "File" in the upper left hand corner. From the drop down menu, click on "Save As... Give your return a new name. You can then add your W-2 and then print and mail your state return. When it's time to amend, you will use the original file, not the newly save one.
