How to create a core data with more than 1 table with relationship?

Hi, I am studying iPhone programming for about 2 weeks, and I already know how extract sqlite data using sqlite3 library. For now, I want to know how to use core data, I followed this good tutorial by Ray Wenderlich but he only show how to create/import/preload using a single table. Is there anyone who can help me create my own sqlite database with multiple tables and relationship using core data? Thanks in advance!