29 C.F.R. § 541.503 : Labor — REGULATIONS RELATING TO LABOR — WAGE AND HOUR DIVISION, DEPARTMENT OF LABOR — REGULATIONS — DEFINING AND DELIMITING THE EXEMPTIONS FOR EXECUTIVE, ADMINISTRATIVE, PROFESSIONAL, COMPUTER AND OUTSIDE SALES EMPLOYEES — OUTSIDE SALES EMPLOYEES — Promotion work

(a) Promotion work is one type of activity often performed by persons who make sales, which may or may not be exempt outside sales work, depending upon the circumstances under which it is performed. Promotional work that is actually performed incidental to and in conjunction with an employee's own outside sales or solicitations is exempt work. On the other hand, promotional work that is incidental to sales made, or to be made, by someone else is not exempt outside sales work. An employee who does not satisfy the requirements of this subpart may still qualify as an exempt employee under other subparts of this rule.
(b) A manufacturer's representative, for example, may perform various types of promotional activities such as putting up displays and posters, removing damaged or spoiled stock from the merchant's shelves or rearranging the merchandise. Such an employee can be considered an exempt outside sales employee if the employee's primary duty is making sales or contracts. Promotion activities directed toward consummation of the employee's own sales are exempt. Promotional activities designed to stimulate sales that will be made by someone else are not exempt outside sales work.
(c) Another example is a company representative who visits chain stores, arranges the merchandise on shelves, replenishes stock by replacing old with new merchandise, sets up displays and consults with the store manager when inventory runs low, but does not obtain a commitment for additional purchases. The arrangement of merchandise on the shelves or the replenishing of stock is not exempt work unless it is incidental to and in conjunction with the employee's own outside sales. Because the employee in this instance does not consummate the sale nor direct efforts toward the consummation of a sale, the work is not exempt outside sales work.

29 C.F.R. §541.503