Create dimension groups in the New Dimension Group editor, found in the Dimension Groups view.
To create a new dimension group:
In the Project Explorer's Project tab, double-click Dimension
Groups
to open the Dimension Groups view.
Click New. The New Dimension Group editor appears.
In the Group Name box, type a unique name for the dimension group.
Select the dimension(s) you want to add in the All Dimensions list
and click Add.
You can add dimensions one by one or hold down the
Ctrl key and add several at a time.
Note: There is no limit to the number of dimensions in a group, but each
dimension can only belong to one group.
Click OK. The new dimension group is added to the list of available dimension
groups.