The Generate menu has two options - Generate Destination, Generate And Auto Map Destination.
Select Generate Destination to internally create a destination class with the same structure as the source select/cursor. But this destination class is not added to the destination side container class.
Nodes Configuration_ Figure 25: Mapping Destination
Incase of Generate And Auto Map Destination, it generates the class and also maps it with the source column names. The mapping can be changed if needed.
In both the cases, the name given to the class is the name of the first select or cursor (A message prompts to override if the destination variables are already generated).