In the current BigCommerce product experience, variant options describe purchasable product variations, while modifiers collect additional choices or customisation. The correct setup depends on the product and how its stock, SKU and pricing need to work.
See BigCommerce’s Product Options (v3) and Variants and Modifiers guides. Legacy product-editor workflows differ.
Before changing existing options, consider affected products, stock, pricing and integrations. Send Damien the product examples and desired outcome if you need help planning the work.
The video below is an earlier walkthrough and may show a different product editor.