There is a great variation in practice across organisations due to product features, creativity and testing attitude of the organisation. It also depends on the delivery channel capabilities, e.g. staff training, communication to customer
Down-sell and up-sell offers on the same product are relatively common. These are targeted at either enhancing the risk of the transaction or encouraging higher return.
Cross-selling, in a strict sense, is less common at application point. It is more common to bundle products instead.
However, the cross-selling potential is key in having a more accurate view of the customer value. Assessing this value is more common practice