The parts of the register for the polling districts in a Dáil constituency, so far as they relate to presidential electors, shall be the register of presidential electors for that constituency and, so far as they relate to Dáil electors, shall be the register of Dáil electors for that constituency and the parts of the register for the polling districts in a European Parliament constituency, so far as they relate to European electors, shall be the register of European electors for that constituency and the parts of the register for the polling districts in a local electoral area, so far as they relate to local government electors, shall be the register of local government electors for that area.