Selecting multiple Orders and Creating a single Invoice for them

[MichaelIrelia]

I have an Orders_Table and Invoices Table. In Orders, I want to select muliple specific orders and create 1 new invoice for the selected orders. 

an order already has an invoice_id ref column

[jballester]

this?

https://www.googlecloudcommunity.com/gc/AppSheet-Q-A/Create-an-invoice-from-child-of-multiple-parent...