You can include the following types of ports in a Salesforce Merge transformation:
Salesforce object attribute ports.
Use these ports to update values for the Salesforce object attributes in the master record. The values in these ports override the values in the master and slave records.
Default ports.
When you import a Salesforce object definition, the Designer creates the default input ports and the default MergedID, MergedSlaveID1, and MergedSlaveID2 output ports.