Select the product and click the 'Edit' button; or, click on the 'Product Name' hyperlink.
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Click on the 'Multi-Item' tab.
The Product Type must be 'Service', Inventory', or 'Equipment'; and the 'Multi-Item' Product Setup Option must be selected for the 'Multi-Item' tab to appear.
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The availability of menu items is controlled by privileges that are assigned to each user, so the 'Navigation Menu' will not look the same for all users.