Group sizes, colours, or finishes together only when a buyer can choose the exact version and you can count each one separately. Put the option name beside its price; a shared base price can mislead if some sizes or finishes cost more. Pause choices that are unavailable instead of leaving them implied by a general photo.
Use one naming scheme across shelf labels, stock notes, and the storefront. For clothing, list the maker's size and a plain colour description; for furniture, use the finish name shown by the supplier. Photograph real versions or mark a representative image clearly. A separate code for each sellable combination helps prevent a helper from picking a near-match.
Combining choices reduces clutter, but separate pages are clearer when condition, contents, or price differs. Update counts after counter and online sales, and make it obvious which option is unavailable before a buyer confirms.
