You may want to create a data cube that includes unrelated tables. You can set up separate cubes for the tables, and then you can combine the cubes into a virtual cube.
Before you can create virtual cubes, you must already have defined the cubes that you want to include in the virtual cube.
Open the 
BA
Db. Overview window. Select the line with Virtual Cubes
in the Description field, and
then click Functions,
New. Click Yes.
Enter a name in the Name field.
In the Cube Name field, click the AssistButton. A list appears of the cubes that you have defined. Select a cube that you want to include in the virtual cube.
You can include as many cubes as you want in a virtual cube.
Defining Cubes in a Business Analytics Database