Every standard invoice that does not yet have an invoice number and has neither been rejected nor closed can be assigned to a collective invoice. However, all individual invoices must have the same invoice address and cost centre and belong to the same company^M.

1. Close all events that contain individual invoices.
2. In the collective invoice segment (below),  Add individual invoices to the collective invoice.
3. Select invoices from the current event by left-clicking on the picklist. All invoices from the same event that fulfil the requirements are shown in the picklist.
4. Select invoices from other events by clicking  Add and selecting  Search for partial invoices. Any invoices from other events meeting the requirements are shown in the picklist. Left-click any of these to add them to the collective invoice.
5. Select multiple invoices from other events by holding down the Ctrl key and clicking  Confirm.
6. To change the order of the invoices, drag-and-dop the lines with the left mouse button presen down.