1. Open /admin/addons-groups and click Add New; enter a Name and optional Image, then Save.
2. On the group page click Add Ingredient or Sub-recipe, search / filter and click + on each item.
3. For each item set: Quantity (default amount, minimum 0.5), Base Price, Min Order Quantity, Max Order Quantity (if max is lower than min both reset to 0 = no limit), and optional Quantity Pricing tiers - click the + icon and enter Product Quantity and Price increase. The page's own example: an item at $4 per unit with a tier of 2 - $2 means any quantity above 2 increases by $2 per unit, so 3 units cost $6 and 4 units cost $8.
4. Click Save.

The list shows each group's ID, image, name (click the name to rename inline), number of items and edit/delete icons. Deleting a group removes it and its items immediately - there is no confirmation prompt.