Stock In Transit is units from a Production Order that you have added to an In Transit Note (Advanced Shipping Notice)
Select the products you are interested in or leave blank for a full report
From the Reports dropdown select [In Transit]
The report will open with the sizes displayed horizontally
If there are no results - screen will be blank
Select relevant record and from [X Selected] click [Print ]
This report can be generated in Excel and CSV formats from the Reports module
Go to Reports > System Reports > Products > Inventory > Full Product Inventory