Wis. Stat. § 198.05: Subdistricts, boundaries.

Every petition or resolution provided for in s. 198.03 shall divide the proposed district into 5 subdistricts, giving each a number, except as provided in s. 198.07 (3). In the event that the boundaries of the district as originally proposed are changed at the election, provided for by s. 198.06, and approved by the commission pursuant to s. 198.06 (5), the commission shall make adjustments in the boundaries of the subdistricts that are necessary to comply with s. 198.07.