Hello there, @sonicrooterandpl.
It's nice to hear from you. I'll make sure you'll be able to add the work address on the invoice.
In QuickBooks Online, you can have an additional field to include the work address on the invoice.
To complete the process, you can follow the steps below.
- Go to the +New button.
- Select Invoice under the Customers column.
- Click the small Gear icon.

- Click the Manage custom fields link.
- Hit Add field button.
- Enter Work Address and tick the All Sales forms box.
- Then, Save.

Another way is use the Message on invoice field box to enter the work address.

Also, when creating a transaction, you're required to enter the shipping address and billing address. The shipping address is an address where you will send the order. And, the billing address is the address connected to the customer’s payment method.
You may want to read through these articles to learn about creating custom fields, and customizing templates:
Keep me posted on how this goes by leaving a message in this thread. I'd be glad to help you out.