Okla. Stat. tit. 19, § 863.29

From and after the time such commission is constituted by the cooperating governmental units, it shall have exclusive control for the purposes herein provided over the territory within such city and the unincorporated areas of the county to the exclusion of any other planning and zoning agency, excepting therefrom any city or county boards of adjustment. The now existing city and county planning commissions shall transfer to this commission upon its activation all records, resolutions, maps, charts, plats and other descriptive matter which said city or county planning commissions shall have in their possession.