Salesmanship is defined as the level of skill you have in convincing people to buy or in persuading people to do something.
(noun)
A worker at a car dealership who sells the most cars month after month is an example of a person with great salesmanship skills.
A manager who successfully motivates a staff to take on and accomplish a project on which they may be reluctant to work is an example of a person with great salesmanship skills.