Returns are where billing software usually gets vague, which is a problem, because returns are where arguments start.
Tied to the original bill
A sales return is raised against the bill it came from, and it keeps that link — the parent bill number and date travel with it. You are never guessing which sale a refund belongs to.
Cash back or store credit
When you settle it, you say how: a cash refund handed back, or store credit left on the customer's account. Whichever you pick, the reversal posts to the ledger, so the customer's balance and your day's cash both reflect it without a second entry. A return can also be cancelled, and that cancellation reverses cleanly too.
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