Get similar values in a Graphic Widget in a group that represent one single value

We are currently triying to get similar values in a Graphic Widget united, they are all part of a dimension called "Source Of Hire" in a Recruiting People Analytics Story Report.

These values represent the same source, so we look forward in having those in a group so instead of 25 values, we have around 8-10 in the widget.

For example:

Source of Hire values:
-Job Board
-Jobs2Web
-Corporate Site
-Forwarded
-Internal Referred

Grouped Values Graphic Widget should be like this:
-Job Board + Jobs2Web
-Corporate Site
-Forwarded

-Internal Referred