Groups with prebooked events and/or hotels pay only some items for the group participants. Other items have to be paid by the participants themselves.
In the download to Eventure, the group participants are connected to this group, the goup events that the group prebooked will be paid by the group. All other events/hotels the group didn't prebook, the participant has to pay him/herself.
In the company data, check the box as shown below.