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A modifier group is a question you ask the customer when they order: which sauce?, what size?, anything to add?. The group defines the question, the possible answers, and how many they can pick. It’s defined once and reused: the same Sauces group serves all ten burgers on the menu, and the day you add a new sauce it shows up on all ten. Go to Restaurant OS → Menu and Products → Modifier groups.
Modifier group list

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The minimum you need to know

1. Options are catalog products. To offer extra cheese there has to be an extra cheese product. You don’t write loose options.2. An option’s price comes from the product, it isn’t typed here. This screen shows it read-only.3. You only set two numbers: the minimum and the maximum. Whether the group is required, and whether it takes one option or several, is not chosen — the screen derives it from those two numbers.

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The simple path

  1. New modifier group, give it a name — Sauces, Size, Extras.
  2. Set the minimum and the maximum number of options the customer can pick.
  3. Save, and on the Options tab find the products that will be the options.
  4. Go to each product that uses this group and add it from its Modifier Groups tab.
A group does nothing on its own. It starts working when a product uses it.

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The selection rules

Selection rules card: minimum, maximum and the derived badges
The card has only two fields: Minimum options and Maximum options. Nothing else. Below them two badges appear — Required or Optional, and Single or Multiple — with the line “Derived from min / max values”. They are not fields: they are the result of the two numbers you set.
Why it’s derived instead of chosen. A group marked “optional” with a minimum of 1 would be a contradiction, and somebody would discover it when a customer couldn’t finish their order. By deriving it from the numbers, that contradiction cannot exist.
Examples that cover almost everything:

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Options are products

Here’s the surprising part: an option is not a loose piece of text. Behind every option there is a catalog product, and the Options tab offers two ways to get there.
Options tab with the products assigned as options
There’s a practical reason: an option has a price, taxes, a PLU code, a kitchen recipe and a name in three languages. All of that already lives in a product, and duplicating it would mean maintaining it twice.
That’s why the Modifier product type exists. In Products you can create a Modifier product — extra cheese, double patty — that exists to be an option, not to be sold on its own. Just turn off its Show in menu: the product doesn’t appear on the menu but stays available inside combos and modifiers.
Options are reordered by dragging, and that’s the order the customer sees them in. Options are not saved on their own: when you’re done you confirm with Save options.

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What gets defined per option

Add option dialog, with the option's identifiers and descriptions
The dialog’s Price tab is read-only: it shows the net, the gross and the suggested price of the product you picked. The screen says so: “Values from the selected product (read from product detail)”.
To change what an option costs, you go to the product or to the price list. It isn’t edited here. If extra cheese has to cost something different, the price is corrected on the extra cheese product or on the matching price list.

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The same group, different on one product

A group is defined once, but a product can depart from it without breaking the others. That’s done from the product record, not here. From a product’s Modifier Groups tab you can change, for that product only:
  • the title the group is shown with,
  • the minimum and the maximum,
  • the price of each option.
Whatever you leave at the group’s value keeps being inherited. Whatever you change is marked Custom for this product.
It’s the same pattern as the rest of the catalog: define it once at the top and adjust it below only where needed. The Extras group can cost more inside the premium burger without that touching the others.

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Recipes: how the real cases get solved

  1. Create the sauce products in Products, type Modifier, with Show in menu off and price 0.
  2. New modifier group, name it Sauces.
  3. Minimum 0, maximum 1. The group ends up Optional · Single on its own.
  4. Options tab: add the sauces and order them by dragging.
  5. On each product that carries them, Modifier Groups tab → Add group.
  1. Create the Small, Medium, Large products as Modifier, each with its price.
  2. Group Size, minimum 1, maximum 1. It ends up Required · Single.
  3. Mark Medium as Default option so it comes pre-selected.
With a minimum of 1 the customer can’t move on without choosing, which is exactly what you want when the price depends on the size.
Don’t duplicate the group. Go to the premium product’s record, Modifier Groups tab, open the group and edit that option’s price for this product.It gets marked Custom for this product and the other products keep the catalog price.
If it’s just for today, don’t touch this: use Out of stock, which brings it back on its own at closing.If it’s permanent, turn off Availability on that option: it’s left out of every menu that uses the group.

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Mistakes that cost money

Setting a minimum of 1 on a group you meant to be optional. The group becomes required and the customer can’t finish the order without answering. There is no “optional” switch to contradict it: look at the badges under the numbers before saving.
Creating options as sellable products. If a Modifier product is left with Show in menu on, extra cheese appears on the menu as if it were a dish. Turn it off: it keeps working as an option.
Looking for the option’s price on this screen. It’s read-only here. It’s corrected on the product or on the price list, and from there it reaches every group that uses that option.
Turning off an option’s Availability for something temporary. It leaves every menu and stays that way until somebody undoes it by hand.

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Glossary

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Frequently asked questions

Search and assign product only shows the ones that already exist. If it isn’t there you have two ways out: create it in Products — usually as type Modifier — and search again, or use Add option and enter its details from here.
On the product behind that option, or on the price list that destination uses. If it only has to change inside one particular product, that’s done from that product’s Modifier Groups tab.
A group doesn’t reach the menu on its own. It has to be assigned to the product (the record’s Modifier Groups tab) and that product has to be in a menu that has been synced in Menu assignment.
That’s expected, and the screen warns you beforehand: “A modifier cannot have modifier groups”. A modifier is an answer, not a question, so it can’t have groups hanging off it.

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What’s coming

  • Nested groups: today an option cannot open another group of questions in turn.