This members-only tutorial shows how we can create a custom function that returns a count of the number of linked upsell products for a WooCommerce product and use this via the Dynamic Data condition to have an element be output only if there is at least 1 upsell (or conversely if there is no upsells if that is what you want) on single product pages.
Note: This is where/how we can specify upsells for products:
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Title: [WooCommerce] Get the number of upsells
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