Breakout is being used as an adjective in the way it is used in the phrase, breakout room or breakout meeting.

"break-out room. A smaller room, near a larger meeting room, for use when a larger group breaks into sections."
http://www.travel-industry-dictionary.com/break-out-room.htm...

Breakout Rooms. Definition: Small meeting rooms used for specialized sessions that are part of a larger meeting, conference or event.
http://www.cvent.com/en/resources/breakout-rooms.shtml

A breakout report is a report on a smaller group, or a subsection or an organization -- which is also being studied as a whole.

The following are two examples of use of breakout report which also fit with this meaning:

Breakout
• Participants broke out into groups and discussed:
o What were the main findings of the National Math panel
regarding this issue?
o What surprised you about the findings?
o How do you see the Math Panel Findings reflected in Utah teachers and
teacher programs?
o What recommendations would you make for Utah based on the Math Panel
Report?
• Results of the breakout reports can be viewed on the Power Point
http://schools.utah.gov/curr/math/sec/documents/MathSteering...

Breakout reports can be generated to cover different workgroups (divisions, regions, etc.) to allow benchmarking throughout the organization. ...
http://www.humansynergistics.co.kr/download/HS-LSI - OCI - O...