Steps:
From your Shopify admin, go to Products.
From the Products page, click Add product.
Enter a title for your product, along with additional details.
Click Save.
Duplicate a product
To save time when you add a new product, you can duplicate a similar product. If you want to add options to an existing product, such as color or size, then add a variant to the product instead of duplicating the product.
When you duplicate a product, you have the option to copy one or more of the following product details:
images
SKUs
barcodes
inventory quantity
If you leave the options unselected, then these product details are left blank in the duplicate. Other product details except 3D models and videos are copied from the original to the duplicate.
By default, the duplicate product's status is set as draft, and hidden on all your channels and apps. The duplicated product isn't available to sales channels until you change its status as active. You have the option to make the duplicate available to the same channels and apps as the original product. In this case, depending on the sales channel, the duplicate product may be published immediately after it's created.
Steps:
From your Shopify admin, go to Products.
Click the name of the product that you want to duplicate.
Click Duplicate.
Enter a name for the duplicate product, and then click Duplicate product.
Modify the product details.
Optional: Make the duplicate product available to the same channels and apps as the original. When the product status is set as active, depending on the sales channel, the duplicate product may be published immediately after it's created.
Edit a product
After you've created products, you can edit them to change their descriptions, prices, and any other product details.
Although you can change your product details at any time, the changes can affect your reports. For information on how the changes can affect the way that products appear and are grouped in your reports, see Changes to product details.
Saved changes take effect immediately in your online store. Before you update a product, you can check the top of the page to see if another staff might also be making changes to the same product.