Upselling

Upselling is a sales technique where a seller induces the customer to purchase more expensive items, upgrades or other add-ons in an attempt to make a more profitable sale. While it usually involves marketing more profitable services or products,[1] it can be simply exposing the customer to other options that were perhaps not considered. (A different technique is cross-selling in which a seller tries to sell something else.) In practice, large businesses usually combine upselling and cross-selling to maximize profit.

Upselling vs Cross-selling
Upselling is the practice in which a business tries to persuade customers to purchase a higher-end product, an upgrade, or an additional item in order to make a more rewarding sale. For instance a salesperson may influence a customer into purchasing an iPhone 5S, instead of an iPhone 5, by pointing out its additional features. "And this over here is our super deluxe model." A similar marketing technique is cross-selling, where the salesperson suggests the purchase of additional products for sale. For example, he might say "Would you like some ice cream to go with that cake?" It is beneficial for businesses to use both techniques in order to boost revenue and provide a valued consumer experience. However, research has shown that upselling is generally more effective than cross-selling (Lazazzera, R.,2015, March 4).

compare with:

"De nombreux Tier 1 récemment gagnés par OA à développer avec pour objectif le niveau d’activité déjà réalisé auprès de X, Y"

élevage ... = upselling to ...

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Note added at 23 hrs (2017-06-27 13:20:47 GMT)
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"élevage" in the sense of "going up" with the volume of sales to exiting clients
=>
upselling

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Note added at 3 days3 hrs (2017-06-29 17:18:32 GMT)
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"élevage" in the sense of "going up" with the volume of sales to existing clients