Yes, depending on where at the beginning you want to start ( My Info, Federal, State) look to the left-hand side of your TurboTax Online screen and you will see a black menu. Under 2017 taxes you should see the options I bolded above. Your personal information will be under My Info, your federal tax information will be under Federal - once you click federal you will see tabs at the top that say (Wages&Income, Duductions&Credits, Health Insurance, Other Tax Situations, and Federal Review). These tabs can be clicked on to get to any of those portions of your tax return.
Now if you want to start from the beginning and clear your return completely then please see below: