A port authority that is created by the exclusive action of a municipal corporation and located within an existing port authority created by a county may levy a tax under section 4582.40 of the Revised Code only if the existing port authority created by the county has no such tax levy in effect. Unless the existing port authority created by the county subsequently levies a tax under section 4582.40 of the Revised Code, one-half of the proceeds, or such percentage as is agreed to by the boards of both port authorities, from any tax levied under the authority of this section by a municipal port authority shall be distributed to the existing port authority created by the county within which the municipal port authority is located, to be used by the existing port authority created by the county for the purposes established under section 4582.40 of the Revised Code.