Other users also asked about this, usercontact.injazcon.
Currently, the inventory feature in QBO is designed for one location only. However, I also like the idea of tracking inventories for multiple locations that's why I'll take note of this for future enhancements.
On the other hand, you can try finding an app that can be integrated into QBO to track inventories in multiple warehouses. You can search using the Google search engine or using other browsers.
If you have other queries about inventory tracking, please don't hesitate to go back to this thread.