Each measure of a general nature hereafter adopted, other than an ordinance of general application limited to a single occasion, wherever practicable, shall be of a form reenacting, revising, supplementing, or amending an appropriate title, chapter, or section of this code. An ordinance when so adopted shall become part of this code as though included in its original enactment, and shall repeal any previous section or sections intended to be repealed thereby.
('73 Code, § 31.04)