Make a Custom Selection
To make a custom selection, start by finding the required hierarchy within its dimension.
Click the hierarchy's arrow to open its sub-menu; from the sub-menu, click the Custom button to open the Custom Selections menu.
Select the checkboxes of the elements you want to add to your discovery. In this example, four elements were selected from the Manufacturer hierarchy: Acme, Old Balance, Ribuck, and Slicenger.
Once you've made your selections, click OK.
The custom selections will be added to the discovery: