I'd say it means to manipulate the relationship(s) (with the customer(s)) in such a way as to make it/them profitable to the company.
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Trunks One meaning of "manage" says: to succeed in doing sth, esp. sth difficult. Another says: to use money, time, information, etc. in a sensible way. E.g. Don't tell me how to manage my affairs. (Does this meaning mean "to handle effectively)Your definitions leave no room for bad managers and bad management.