If you have already paid the TurboTax Fees you will not be able to delete the state return. However, you will be able to file the federal without the state. When you get to the Let's get ready to e-file screen, select the File by mail button and click the I'm not ready to file radio button below your state and click save.
For additional information please see the following TurboTax FAQ. https://ttlc.intuit.com/replies/3374295