Hey Dianna101, 

Thanks for reaching out to us here. Understanding how QuickBooks handles data once you turn certain feature off is important. Here is a helpful guide that will explain what happens when you turn off Advanced Inventory.  I hope this helps to answer your question! 

If you have any other questions, feel free to reach back out to  us here.

I've read through the guide and it doesn't really specify what location inventory would go to once you turn off Advanced Inventory. I can only assume it maintains the same location?