Assuming you use the TTX Online software for 2017 taxes:
You would need to buy, download , install, and use the 2017 Desktop software, download your 2017 .tax2017 datafile from your online account , and use that to to "Amend" your 2017 tax filing to include an amended MD tax return that was changed to a Part-year resident MD tax return, and then add in a new Part-year VA resident tax return.
While it "can" be done using that TTX software, the proper allocation of the Part-Year income between MD and VA, due to the Reciprocal tax agreement between those two states, would require a tax preparation adeptness that would make that process quite difficult...a local professional tax preparer would be smarter...and they probably are not very busy now.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
