Log into your account at admin.pressero.com, and go to Sites > sitename > Products. There is a blue bar at the top of the products listing labeled Product Duplication. 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 Name: allows you to enter a name for the copied product.
New Product URL: allows you to enter a new URL 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.