Displaying your company address on your invoice is an integral part of providing accurate documentation to your customers. If you have two separate work locations, you can easily create a separate invoice template for each address. That being said, you're not able to add both addresses on the same invoice.
Since you're only able to add one address per invoice, you can add a custom field to display your second address. To do this, click the Gear icon > Custom Form Styles > New Invoice > Content > Click the top section of the form > Check off the Custom field box > Call this field "Alternative address" or whichever name works for you.
Now when you create your invoice, you can add the second address into the custom field box provided, and this will appear on your invoice.
I know this isn't exactly what you were hoping for, but I hope it's a workable solution. I'd recommend submitting feedback about this to our product developers, as I think it would make a great addition to the product. To do that, click the Gear icon > Feedback.
If you have any other questions, please don't hesitate to reach out to our tech support team.
I have a similar problem. Our situation is as follows
How to achieve this with Quick Books?
Being able to customize your address is a great way of providing your customers with the correct information for your business. I can help go over a bit about this.
At this time the only way to have two addresses would be to change it each time you need to send an invoice out from that site. You can make this change by going to: Gear>Account and Settings>Company>Address. While QuickBooks Online Plus does allow for multiple sites this doesn't always work when it's involving different countries. This is due to many reasons such as difference in taxes and how you're recording and filing for remittances to the related governments. I suggest reaching out to an accountant or business management professional regarding if you should be tracking these in separate books or not. If you don't have an accountant you can find one in your area by going to: My Accountant>Find a Pro to Help.
Hope this helped!