The change in the forum engine prevents me from following on the older topic, so I've missed the question.
Now, Every product in Shopify does have at least one variant, even if it does not show in the Admin.
If you're saying that you still have one teapot in stock, but want to offer adding a teapot cover for extra $5, then variants would not work, because creating an extra variant for "Teapot with cover" will break your inventory.
This is where you may use one of the "product options" apps, like free infinite options App, which now offer priced options.
|an hour ago|