In the Classification Explorer, while searching for the Classification node, It results the corresponding WTPart for that node in the Search Results table. In the Resulted WTParts, we can select one WTPart and check for the Similar parts using "Find Similar Parts" actions. According to the node value selected, Attributes will present in the "Find Similar Parts" table.
As in the above snapshot, Selecting the Attribute "Cable Armour Material" and selecting the value as "Galvanized Steel" from drop-down and click on search.
In the above Search Results table, we can see it is resulting the WTPart having value "Stainless Steel" and this should not results. Only the WTParts having the searched value "Galvanized Steel" should come in the result