Ohio Rev. Code § 307.152
A board of county commissioners may enter into an agreement with a county, municipal, or regional planning commission, or county engineer for the preparation in whole or in part of comprehensive transportation and land use studies and major thoroughfare reports, upon such terms as are mutually agreed upon.
Any agreement with a county, municipal, or regional planning commission may provide that contributions of county funds shall be credited to a separate fund of the planning commission from which expenditures for fulfilling the agreement are made. Any moneys contributed to a county, municipal, or regional planning commission for preparation of such plans may be credited to the county's portion of the cost of the preparation of such plans. The agreement may provide that county funds appropriated for the county's portion of such plans or in excess of the county's portion of the cost of such plans shall be refunded to the county fund out of which the contribution was originally appropriated, when the county, municipal, or regional planning commission receives federal or other funds in payment for such projects. The agreement may provide that only allowable reimbursable expenses shall be included in calculating the county's portion of the costs. The terms of the agreement may include other provisions mutually agreed upon.
The board of county commissioners may pay the costs of the agreement for the planning necessary to satisfy the continuing comprehensive transportation planning process from revenues derived from the motor vehicle license tax, the motor fuel excise tax levied by section 5735.05 of the Revised Code, the county general fund, or any other county fund which may be expended for planning purposes and may also pay costs for other planning from the county general fund or any other county fund which may be expended for planning purposes.
R.C. § 307.152