You can invoice multiple FIXED-PRICE projects at once if they belong to the same client and use the same billing address.
The projects don't have to be under the same brand - they can belong to different brands, as long as those brands share the same client and the same billing address.
The process is the same as invoicing a single project. In the first step of invoicing, simply select multiple projects from the list - you can pick projects across different brands, as long as they belong to the same client.
Important: The only difference is in the second step of invoicing: instead of a single list of budget items, you'll see an expandable section for each selected project, where you can access and select that project's budget items separately.
