If you have a number of service workorders ready for invoicing that are all for the same client, you can have QBI have QuickBooks invoice all those into one invoice to the same linked QuickBooks client.
1. QBI lists by the client. In the screenshot below we have service workorders ready to be invoiced for three different clients.
2. You can expand to see what workorders are for each client by select the 
beside each client name <note how the image turns to a 
image when you select it to show it is expanded>
3. To invoice all AyaNova service workorders for one client into one QuickBooks invoice
a. Select the object indicator for the client (the square to the left of the client name)
b. Now either right-click and select -> Invoice selected items to QuickBooks... Multiple workorders per invoice
c. Or with that that client object indicator selected, select the menu Invoices -> Invoice selected items to QuickBooks... Multiple workorders per invoice
4. Once all service workorders for a client have been invoiced, the client no longer displays in the list as there are no further workorders for that client to invoice
Do be aware because of the QuickBooks invoice space limitations, your descriptive text may cause the invoice to span many pages.