Group products into categories (and sub-categories) so reports, the POS grid, and the storefront stay organized as your catalog grows.
Products → Categories.
Click New Category. Name (e.g. "Beverages"), optional icon, optional default tax rate. Save.
Open a category, click + Sub-category. Sub-categories inherit settings from the parent unless overridden.
When creating or editing a product, pick the category from the dropdown. Bulk-assign existing products via Products → Bulk Edit → Set Category.
Drag-and-drop categories in the list to change the order they appear on the POS grid and the storefront menu.