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Hi Duy,
Have you taken a look at our general purpose training materials (available at the link below)?
www.energycommunity.org/TrainingMaterials
The following may also be helpful:
http://energycommunity.org/WebHelpPro/Concepts/Expressions.htm
http://energycommunity.org/WebHelpPro/Wizards_and_Properties/Expression_Builder.htm
Take a look at these links and let me know what specific questions you have afterwards.
Best,
Tory