Using Tabular Models - SQL Server Analysis Services 2012 Cube Development - page 347

2. As you can see, here every table exists as a single partition that contains all
of the data. Our next step is to create a new partition by clicking on the New
button. You will now see that a new partition has been added named Inter-
net Sales . It is currently exactly the same as the initial partition.
Note
If we stop here, it will duplicate the data in our table. There is nothing here
that will magically prevent the duplication of the data. This is the respons-
ibility of the modeler.