You can create a relationship between existing products.
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Select the category or product that you want to associate products to, and then
click the Relationships tab.
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Click the toobar item to add an item.
A context menu appears.
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From the context menu, select the type of relationship to create: Cross-sell or
Up-sell.
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Use the Item Picker to search for and select items to
associate for a relationship.
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Click the Check icon in the toolbar to close the
Item Picker.