Step 1: Enable Modifier Quantity in Square

• Log in to your Square Dashboard.
• Go to Items → Modifiers.
• Click Save when you’re done.
• Select an existing modifier group or create a new one.
• Under Selection Rules, choose whether a selection is required and whether customers can select more than one modifier.
• Turn on Allow more than one modifier to be selected — this unlocks an additional toggle called Allow multiple quantities of a single modifier.
• Toggle on Allow multiple quantities of a single modifier to let customers select more than one of the same modifier (for example, “2x caramel drizzle”).
• If a modifier is required, you can also set a minimum greater than one. When “allow more than one modifier” is on, you can set a maximum number of selections if needed.
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Step 2: Enable Modifier Quantity Selector in the Per Diem Merchant Dashboard

• Click Save to apply your changes.
• Log in to your Per Diem Merchant Dashboard.
  
• From the left-side menu, select Items.
• Find the item you want to update and click Edit Item.
• Scroll down to the Modifiers section.
• Click the three dots beside the modifier group and select Customize.
• Toggle on the Modifier Quantity Selector.
• Set the Modifier Quantity Limit — the maximum number of units a customer can add for that modifier.