When adding upsell items the sequence is automatically set to 10 meaning if you have a large list of upsell items you need to start from the bottom to get them in the correct order.
some customers sometimes have 70 to 100 upsell items which they have in a specific order so the sales reps can see the product in a set order. They have realised that adding new lines to an upsell item always add the new line as sequence 10. Once they have added all 70 is lines, they're often in the opposite order to which they have been added. So if they add 'product A' first, as the most likely upsell items the customer might purchase; it will end up at the bottom of the list.
In summary, when new lines are added to upsell, we shouldn't add them the next number in the sequence so the item is added to the bottom of the list.
