Hello @ckchew,
As of the moment, there isn't an integrated way to add two logos for a company. With this, I'd suggest letting our product developers know about your request by sending feedback. I'll show you how.
- Go to the Gear icon.
- Select Feedback.
- Enter a few words describing how you wanted to use more than one logo for your business.
- Click Next.
Additionally, here's a couple of articles you can read helpful in keeping you up-to-date with the latest software improvements and enhancements: Customer Feedback for QuickBooks Online.
Keep in touch if you need any more assistance with this, or there's something else I can do for you. I've got your back. Stay safe!