The word Upsell is a marketing term that what it promotes is simply and simply to offer it logically another product that satisfies the following logical need that one of its customers or visitors has.
To show an example. If you have a beauty salon and someone arrives by a haircut you could offer you a new dye for your hair that makes you see younger and fashionable.
Or if you have a bakery and someone gets to buy the typical bollitos hands, You without the person requesting it could offer the butter, Patecito and coffee.
The idea is to sell more but always thinking that the offer should be the solution to a logical need that the person has. That is, it must be something that really is benefit to her or him.
If you do not have a UPSELL for the needs of your customers, you can implement it. That is your challenge now. If you cannot create it, make a strategic alliance with the person who can offer it and receive a commission for referring to customers.
What you should not allow, It is to believe that with the sale of the bread pollitos there the business is over.
Do you want to stop making money? Take a while to think!