From your Shopify admin, go to Discounts.

From the Discounts page, click Create discount.

In the Discount code section, enter a name for the new discount code, for example, 15offnecklaces. To generate a random discount code, click Generate code.

In the Types section, select the discount type that you want to create.

In the Discount value box, enter a monetary or percentage value for the discount.

In the Applies to section, select what this discount applies to: all products, specific collections, or specific products.

• If the discount applies to specific collections or products, then use the search field or the Browse button to add them to the discount.
• If you want to remove a collection or product from the discount, then click X to delete it from the list.

Optional: If you're creating a fixed value discount code that can be applied to specific products or collections, then you can check Only apply discount once per order to limit the customer to using the code only once per order. Otherwise, the discount applies to all eligible products in the order.

Optional: If you want to set a minimum requirement for the discount, then select one in the Minimum requirements section.

• Minimum purchase amount requires customers to spend a minimum amount to qualify for the discount. If the discount applies to a specific product or collection, then only these items contribute to the minimum purchase amount.
• Minimum quantity of items requires customers to order a minimum number of products to qualify for the discount. If the discount applies to a specific product or collection, then only these items contribute to the minimum quantity amount.

In the Customer eligibility section, select who this discount applies to: everyone, specific groups of customers, or specific customers. Learn more about creating customer groups.

• Use the search field to choose the individuals or groups that you want to receive the discount. Customer listings show the email used to register for your store. If no email was provided, then the listing shows the customer's phone number.
• To remove an individual customer or group of customers from eligibility for a discount, click the X next to the customer's or group's name.

If you want to limit discount usage, then check one of the options in the Usage limits section:

• Limit number of times this discount can be used in total lets you set a total number of times that a discount can be used. For example, setting a limit of 200 allows the discount code to be used 200 times across your customer base. If you choose this setting, then customers can use the discount multiple times.
• Limit to one per customer tracks a customer's email address or phone number to limit the discount to one use per customer. This only applies to fixed value discounts.

Use the calendar in the Active dates section to set the start date for the discount.

• If you want to set an end date for the discount, then click Set end date and use the calendar to choose when the discount ends.
• If you don't choose an end date for your discount, then it doesn't expire. If you want the discount to be valid for only one day, then select the same calendar day for both the start date and the end date.

Click Save discount.

Your new discount now appears in the Discounts tab in your Shopify admin. To distribute this discount, you can send the code to your customers by email, or display it on your online store. Your customers need to enter the code during checkout to receive the discount.