If you are on our Trial, Basic or Pro plan you can set up group submissions in your assignment.
If you wish to set up group submissions in your assignment go to your assignment's Settings tab and click Groups in the side menu. If you tick the checkbox to allow students to submit in groups an additional option will become available to set the max. number of students for each group.
Group to group feedback
By default students review individually even if they submit as a group. However you can enable group to group feedback by ticking the box for 'Enable group to group feedback' under Group settings. When this is enabled feedback will be given from the group that submitted together.