cross-sell
[ kraws-sel, kros- ]
/ ˈkrɔsˌsɛl, ˈkrɒs- /
verb (used with object), cross-sold, cross-sel·ling.
to sell or try to sell (similar or related products or services) to an existing customer.
verb (used without object), cross-sold, cross-sel·ling.
to engage in cross-selling something.