Hello there, The Bookkeeper.
There hasn't been any changes on the Bundle feature. QuickBooks Online (QBO) calculates the total rate of the bundle item has been the price of each inventory component.
For more information, I recommend checking out this article: Introducing QuickBooks Bundles and Reorder Points.
I'm also linking an article in case you need help with adjusting inventory quantity on hand.
Let me know if you have any questions or clarifications. I'm always here to help. Have a nice day.