If your boss asks you to be iterative in your sales speech, she means she wants you to repeat the main points many times.
An iteration is a repetition, so something that's iterative is a repeated appearance. When you listen to a symphony, the theme that keeps returning is iterative. You might recognize the word best from the more common reiterate, which means to restate. When after lecturing your kid sister on doing the dishes, you restate the rules of the house — wash what you dirty! — that is the iterative part of your lecture. I think she gets it.