Due to the different modeling styles in the electrical domain and in wreal, it is impossible to provide a 1 to 1 mapping between all functions and modeling practices. It is also impossible to provide a "recipe" on how to create models. The best starting point is an example of a model that does something similar to what you need. By modifying and extending the example, you can build up enough experience to create more sophisticated wreal models.
Sample Model Library
Cadence provides a sample model library of wreal models. The sample library can be found in your Xcelium installation directory in $xceliumHOME/tools/amsd/wrealSamples/. Cadence provides three versions of the sample library, a pure text-based version for command-line users, a IC5141 dfII version, and a IC61x dfII version. Command-line users can directly instantiate the models. Environment users have to extend their cds.lib file to point to the appropriate library location.