A grouping is a set of groups, which can be managed as a group.
In order to assign it groups,
- go to Participants (1),
- pull down the configuration menu (2),
- select the link Groups (3),
- go to the Groupings tab,
- find the grouping you want to assign groups to,
- click the icon framed in red (Show groups in grouping),
- in Potential members select the groups you want to assign,
- click Add to add them,
- to return to the groupings tab click Back to groupings.