Dynamic list of values in Crystal report

Hi,

I designed one crystal report with parameter type for list of values are static and dynamic.

Staic Type(City names are manually entered by me at design time)

Dynamic Type( I created a link for City parameter with database, so it should display whatever data available in the database for that particular field)

For static I can fetch the data. but For dynamic list of values, it should fetch the value from Database.

Is there any APIs available to identify whether it is static or dynamic?

How to handle this scenario using CR API's?

Please share your thoughts on this...