The board, by a majority vote of all the members elected, may abolish any board, commission, or office of such county except the school board and school superintendent, and the officers elected by popular vote provided for in Article VII, Section 4 of the Constitution of Virginia, and may delegate and distribute the duties, authority and powers of the boards, commissions, or offices abolished to the county manager or to any other officer of the county it may think proper. If any such board, commission, or office is abolished, those to whom the duties thereof are delegated or distributed shall discharge the duties and exercise the powers and authorities of the abolished entity. Both they and the county for which they were appointed, or by whom they were employed, shall enjoy the immunities and exemptions from liability or otherwise that were enjoyed by the abolished boards, commissions, or offices, prior to the adoption of the county manager plan of government, except insofar as such duties, powers, authority, immunities and exemptions have been or hereafter may be changed according to law.