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Find the old product using your method of choice (e.g. the advanced search form).
Go to the Edit Product page of the old product.
Click the Product Formats link in the sidebar to view a list of formats for the old product.
Set the status of each format to "Replaced". Doing so means that the product will not be purchasable on the public website.
Return to the Edit Product page of the old product by clicking the product name in the formats list.
Near the bottom of the edit page is a section entitled "Related Products". Add the new product to the related product list. Define the relation as "Replaced". Doing so means that there will be a link on the product page of the old product indicating that it has been replaced. In effect, we're pushing the user to buy the new product.
Click the "Save" button.
Verify the product page of the old product on the public website.
