No event
Catalog —
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+ Customer

Bundle presets

Fixed price for N items. Tap one on the Sell screen to ring it up.

End of day

Sync

AirDrop to the Mac if it's nearby, otherwise Save to Files → iCloud Drive/LATS POS/. Either way the merge is the same and can't double-count.

Danger

Only after the event file is safely on the Mac.