Seller Portal → Pricing → Export (the TCGplayer__MyPricing_….csv file). Re-import any time; it replaces what's listed.
Reduce on TCGplayer
Only cards with recorded movement since the CSV export: copies that left here (show sale, trade, marked gone, removal) that TCGplayer still lists. TCGplayer's own sales are excluded, and stock that was never entered here is never reduced (see "not in inventory" below). Upload the CSV in Seller Portal → Pricing → Import (it carries a negative "Add to Quantity"), then click Mark applied — or just re-import your next export.
Card
Cond
On TCGplayer
Left here since export
On hand
Reduce by
TCG price
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On TCGplayer but not in inventory here
Listed on TCGplayer with no stock in the app and no movement since the export. Nothing is reduced on TCGplayer for these. To carry them to shows, pull them into inventory: checked rows below (plus the checked "more on TCGplayer than here" rows under In sync) are added at cost $0 into a chaos-sort lot — only the copies missing here, never the ones already in stock, so re-running never doubles anything.
Card
Cond
On TCGplayer
TCG price
Unlinked listings
Listed on TCGplayer but not matched to a catalog card yet, so they can't be reconciled. Pick a candidate or search, then Link.