I’ve run into the same issue before. QuickBooks Online doesn’t automatically pull the sub-customer’s address or info onto sales receipts, you’ll usually see only the parent customer name.
What I ended up doing was customizing the sales receipt template: in the Customer section, you can manually select the sub-customer instead of the parent, and QBO will pull its address. It’s not fully automatic if you often select the parent, but for recurring invoices or regular sales receipts, you can use the sub-customer as the default, and it works reliably.
Another trick I use is keeping a note in the description field for the parent customer to remind me which sub-customer info to include. It’s a bit manual, but it keeps your receipts accurate without breaking the hierarchy.
