Wis. Stat. § 63.24
The commissioners shall make such rules adapted to carry out the purposes of ss. 63.18 to 63.53 and not inconsistent with ss. 63.18 to 63.53, as in their judgment shall be adapted to secure the best service for the city in each department affected by ss. 63.18 to 63.53, and as shall tend to promote expedition and speed the elimination of all unnecessary formalities in making appointments. All rules so made shall be subject to the approval of the mayor of the city, and they may with like approval be from time to time altered or rescinded by the commissioners. If the mayor takes no action on a rule or an amendment to the rules, submitted to the mayor, within 10 days from the date of its submission, then the rule or amendment to the rules shall become effective as though approved by the mayor. The commissioners shall supervise the administration of rules so established.
Wis. Stat. § 63.24