Categorize replaces string property values on nodes with relationship to a unique category node for that property value.

This example will turn all n.color properties into :HAS_ATTRIBUTE relationships to :Color nodes with a matching .colour property.

CALL apoc.refactor.categorize('color','HAS_ATTRIBUTE',true,'Color','colour',['popularity'],1)

Additionally, it will also copy over the first 'popularity' property value encountered on any node n for each newly created :Color node and remove any occurrences of that property value on nodes with the same 'Color'.