The "Stock Block" on Form 7203 merely refers to the stock purchase transactions the basis calculation is for. For instance, if you purchased all the stock you own at one time, you can enter "1" for Stock Block. If you made an initial purchase of 10 shares in 2019 and purchased another 10 shares in 2022, you will have 2 Form 7203, one with "1" for the stock block (the 2019 purchase) and another form with "2" for the stock block (for the 2022 purchase).
The Section 199A income screen has a check box listed for each line item on your Statement A. Once you have checked the box, for instance for the UBIA (Unadjusted Basis In Assets) another box will open so you can enter the value shown on your statement.
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