Creating tables is normally done in one of the following ways:
- editing an Excel file
- editing via the UI using the Model Page Editor.
- editing via the UI using the Gridview Editor.
- from existing data using the Data to Model feature
- extracting the xMart table definition using a query from a SQL Server database.
If you are creating the model yourself, it’s a good idea to read Best Practices and Data Modelling Basics.