Modifiers are regular products in your catalog, like a pump of syrup or a scoop of whipped cream, that have been marked as modifiers. Two things need to be true before a product can be added to a modifier group:
1. The product exists in your catalog
Create the modifier like any other product in Products → Product Catalog. If it's something you never sell on its own, that's fine. Marking it as a modifier (below) handles that.
2. Its product type is set to Modifier
Open the product from the Product Catalog.
On its Product Management page, switch Product Type to Modifier.
Heads-up: A modifier product can belong to only one modifier group.
If you want the same option in two groups (say, whipped cream on both Pancake Toppings and Waffle Toppings), create a separate modifier product for each group.
Once both are done, the product will appear in the search results when you add products to a modifier group.
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