4.The operations referred to in points 1 to 4 of Section A of this Annex for the preparation of a liqueur wine bearing a protected designation of origin may be performed only within the region referred to in point 3.
However, as regards the liqueur wine bearing a protected designation of origin for which the designation ‘Porto’ is reserved for the product prepared from grapes obtained from the region delimited as the ‘Douro’, the additional manufacturing and ageing processes may take place either in the aforementioned region or in Vila Nova de Gaia — Porto.