Nev. Admin. Code § 425.165
Any order that pertains to more than one child and does not allocate a specific amount of the total child support obligation to each child must include the following notice:
NOTICE: If you want to adjust the amount of child support established in this order, you MUST file a motion to modify the order with or submit a stipulation to the court. If a motion to modify the order is not filed or a stipulation is not submitted, the child support obligation established in this order will continue until such time as all children who are the subject of this order reach 18 years of age or, if the youngest child who is subject to this order is still in high school when he or she reaches 18 years of age, when the child graduates from high school or reaches 19 years of age, whichever comes first. Unless the parties agree otherwise in a stipulation, any modification made pursuant to a motion to modify the order will be effective as of the date the motion was filed.
Nev. Admin. Code § 425.165
NRS 425.620