Join Multiple Sets
If you have more than one set in your report and you want
to perform operations on both sets, you can join multiple sets into
one large set.
Procedure
Select the sets, click the explore button 
, click Union
into One Set, and click Remove Duplicates or Keep
Duplicates.
, click Union
into One Set, and click Remove Duplicates or Keep
Duplicates. Tip: To edit the union, click the explore button , and click Edit
Set.
, and click Edit
Set.