You create a customizable table or matrix by selecting the appropriate package, for example, Add New > Table Customizations > Matrix View or Add New > Table Customizations > Table View.
IBM® Rational® Rhapsody® creates a new view. Open the Features window for the view and select the package scope of the view and the appropriate layout to use (from the CustomizedTableAndLayoutsPkg package), as shown in the following figure:

When the table or matrix view is selected in the browser, it is shown in the Graphic Editor area (typically to the right of the browser).