Using the desktop editions, when you are in the File section of the program and have selected E-file, on the following screen for the state return select Do not e-file my state return now. Continue and e-file the federal tax return.
There may be a state tax return listing for WA, and the Worksheet may also exist. First, see if the worksheet exists. Click on Forms in the upper right of the program screen. Then scroll down to the bottom of the page for state returns. If there is the WA worksheet. click on it to open and then click on Delete form at the bottom of the screen.
If a state tax return exists, while in Forms mode click on the File menu at the top left of the program screen. Click on Remove State Return (if shown)