Path exceptions modeling for ETM

On page 3 of Hierarchical Timing Analysis: Pros, Cons,and a New Approach ,  how is set_output_delay related to set_multicycle_path here in this case ?
and how to re-code the path exceptions ?  Any examples ?

Why need to duplicate the ports for that MCP ?

Someone told me that another way to set path exception is by using set_case_analysis  ?

Path exceptions modeling

In certain situations, path exceptions must be re-coded for ETMs, e.g., when there are multiple output delays on a port and one of the output delays has a multi-cycle path (MCP) through one pin internal to the block. Unless one successfully preserves that internal pin (which increases the size of the model) or duplicates the ports for that MCP, design teams must create and manage exceptions to achieve the same timing result as flat analysis.