I'm here to share some insights about creating supplier's advance payment without TDS in QuickBooks Online.
Currently, you can only enter advance payment for TDS suppliers in QBO. If you haven't already, you can enable this feature. This way, you can add the advance payment. To enable TDS for suppliers, while creating a new supplier, enter the PAN number of the supplier and check the box TDS applicable.
I've added this article to give you the complete details on how to set up the TDS in the system: How to set up TDS.