All appropriations in municipalities subject to this chapter shall be made by vote of the legislative body of the municipality at an annual or special meeting. No such meeting shall appropriate any money for any purpose unless that purpose appears in the budget or in a special warrant article, provided, however, that the legislative body may vote to appropriate more than, or less than, the amount recommended for such purpose in the budget or warrant, except as provided in N.H. Rev. Stat. § 32:18, unless the municipality has voted to override the 10 percent limitation as provided in N.H. Rev. Stat. § 32:18-a.