Thank you, I just filed and paid the taxes, and only that way I found out that the STA is actually entered by the software on the 760 tax form, I only can see the draft of the form for now. I am glad it did, but this is not the way it should have happened, the software should have made more evident the existence of the feature with the correct name on the screen of deductions or adjustments.
By looking at the draft of the state 760 form I also found out that the whole taxable income of the 1040 passes to the 760 VA Tax form including all the Capital Gains Distributions, and all is state taxed by TurboTax at the standard rate as regular income, not like the 1040/IRS does, with a different lower rate for Capital Gains and Distributions.
Thank you for the feedback
