25.— Any document, including a certificate, notice, notification, form or return, relating to local property tax may be combined with such a document relating to any other tax, charge, levy or duty under the care and management of the Revenue Commissioners and any document so combined may be modified by the Revenue Commissioners accordingly in relation to its application to local property tax and other tax, charge, levy or duty or to local property tax only or to those taxes, charges, levies or duties only, as the case may be.