How to import or reference the 12 C WebCapture predefined classes in Capture Client Script code?

Can anyone provide me some assistance or sample 12 C Webcapture Client script code on how to import the Capture Client classes in to the Capture Client Script?

I want to import the Predefined classes in to the capture client codew to dynamically set values to the index fields.

Eg:

The below classes i want to import inside the script

PicklistEntry  Class

PicklistField   Class

TextField   Class

Thanks

M.Subash