It is currently not possible to have multiple logos for your organization. You would be able to upload your company’s logo in the Organizational Profile section which would be used in all of your transactions.
However, if you own a subsidiary, and if you wish to use its logo on your invoice templates, we would suggest you to upload that logo as a Background Image.
Please follow the instructions below to add a background image to your quote/invoice templates:
Click on the Gear icon on the top right corner.
Go to Templates -> Invoices and select the Edit button on the template you wish to add the background image.
In the Customize Template page that follows, under Template Properties, you will find the Background Image section.
Upload an image from your computer by selecting the Choose File option.
You can also choose where the image should be placed in a quote/invoice by selecting one of the options under Image Position.