Where do I fine the answer to Capital Gain from Sale of Virginia bonds?

You should have received a Form 1099-B from the company that consummated the sale which would report the sales proceeds and cost basis. The difference between the sales proceeds and cost basis is the capital gain. If not, you can enter the sale as if you had received that form if you know the proceeds and cost basis.

 You enter investment sales in the Wages and Income section of TurboTax, then Investment Income, then Stocks, cryptocurrency, Mutual Funds, Bonds, etc... Skip the section where it asks if you want to upload your tax documents. Choose Stock, Bonds, Mutual Funds as the type of investment you want to enter. You'll come to a screen where you can enter in your sales proceeds and cost basis.