An IT-140W is a West Virginia form that is the Tax Withholding Schedule (i.e. your W-2 information for WV). It appears to be the type of form that TurboTax generates automatically so that taxpayers will not have to physically attach W-2(s).
Even though this form is not on the list, most West Virginia forms don't appear to be ready yet (that is, the forms and the programming and testing that go on behind the scenes). See state forms availability at this webpage - https://ttlc.intuit.com/replies/3319879