Create separate SKUs per colour to avoid colour-selection confusion

Give each colour its own SKU so designers only have to pick the correct one instead of skipping the colour step.

1. When a component such as a rolling shutter is offered in multiple colours and designers keep skipping the second colour step, the recommended approach is to create one SKU per colour in the catalogue instead of relying on a colour option.

2. Clone the existing SKU in the admin portal, rename each clone for its colour (for example a silver rolling shutter and a black rolling shutter), so designers only have to pick the correct SKU.