@corivo,
I can understand your needs. But right now, Invoices are created against the base address of your company.
So it is not possible to add a drop down option for company branch at this moment. But you can add a text box here by custom coding if you want. In that text field, you can enter “company branch name”.
I will surely discuss this fact with my team and if they like it then we will surely add a text box to write branch name on the invoice.
Thank you 🙂