Some Customers prefer to customize the section of the item record under “Purchasing/Inventory” – “Locations” They would like to move the Available Qty next to On Hand quantity. There is an Enhancement filed under Enhancement #155578.
As an alternative solution,
1. Go to Setup > Company > Enable Features > Select Items & Inventory
2. Under the Items & Inventory Tab, Look and check the checkbox for the Advanced Item Location Configuration
3. Click Save to save the changes
4. Go to the Item and under the Location Sublist you should see the Customize View Button
5. Click the Customize View button and it should bring you to a new page called Customize Item Location Map Search Results
6. Click the Quantity Available Field and click the 6 dots beside the name of the field and drag the field below the Quantity On Hand Field
7. Click Save to save the changes
Open the item again and you should see the Quantity Available Field placed beside the Quantity On Hand Field under the Location Sublist