...
Streams must be created, and belong to the same solution before they can be grouped. For information on how to create streams, see Streams. At the end of this documentation, you find screenshot-based examples of stream group actions.
Create a
...
stream group
Once you have created a solution with the streams needed, you can group the streams in that solution. To create a stream group, select the streams you want to group and click Create group 
.
...