Identify your goal: tender crumb (cakes/cookies) or tender dough (pie crust/biscuits), then choose the closest substitute from the list.
Use the listed ratio (for blends, measure the total flour weight as the recipe calls for and then mix in the stated starch/protein tweak).
Adjust handling: if your dough feels elastic, stop mixing sooner; if it feels dry, add 1–2 teaspoon water per cup of total flour.
If using a starch-added blend, let the batter/dough rest 10–15 minutes before baking to improve tenderness.
Bake as directed, then check doneness early—starch-tenderized flours can brown slightly faster.