How does it know what all simulation engines to display
It is defined in the Component>Engine Profile.
What is the difference between 2 server expressions
1st one stores data in sales_data table while the 2nd one stores in a custom table defined for the custom simulation profile.
Thanks for the response. Is there a system parameter / engine parameter where we mention the custom table name
The table is created as part of the engine profile creation. Refer the implementation guide to create engine profiles.