The Merge Entities stage merges two or more entities into a single entity.
A dataflow that uses a Merge Entities stage requires one or more inputs that identify the entities you are merging. It also has two optional output ports: one contains data for the merged entity and its properties and the other contains data for the records that could not be merged.
To configure a Merge Entities stage, you need to select the model you want to modify and then complete the Options tab and possibly the Runtime tab, depending on which write mode you want to use.