If it's a branch of UBB then you can just search for ОББ in iD: it will find the brand preset from NSI that includes all names, wikidata link, etc. But I understand that here it's the head office. You could still search for ОББ but then manually change amenity=bank into office=company, and add wikipedia=https://bg.wikipedia.org/wiki/%D0%9E%D0%B1%D0%B5%D0%B4%D0%B8%D0%BD%D0%B5%D0%BD%D0%B0_%D0%B1%D1%8A%D0%BB%D0%B3%D0%B0%D1%80%D1%81%D0%BA%D0%B0_%D0%B1%D0%B0%D0%BD%D0%BA%D0%B0 to that node. There's no need to create a relation.