Answer:
Using the campaign influence related list on the opportunity.
Step-by-step explanation:
By using the campaign influence related list on the opportunity a sales user can relate an opportunity to the campaign. With the help of campaign influence, the person will be allowed to other person campaigns listed on an opportunity. A person must hire a person for a role in the opportunity. A hired person will be an expert in doing so therefore the productivity will also be rise by hiring the expert.