Log into your Pressero admin, and go to Sites > sitename > Products. There is a button at the top of the products listing labeled Duplicate Product. Click this to show the Product Duplication options, as listed below.
Sitename: Product List
allows you to choose a product that exists on this site.
Duplicate Product to:
specifies the destination site that the product will be duplicated to.
New Product URL: allows you to enter a new URL for the copied product.
New Product Name: allows you to enter a name for the copied product.
When you have set the correct values for the duplicated product, click the Duplicate button at the lower-left of the window.