Item Details Customizer (Advanced) is an enhanced version of our standard “Item Details Customizer” which allows users to customize Item Details (Product/Services) for Quotes, Invoices, Sales & Purchase Orders. Users can also specify new formulas for each column as well as customize formulas for Totals.     How to Add Running Sub Totals   Go to Menu > Settings > CRM Settings > Extension Pack > Item Details Customizer(Advanced). Click on the “Sales Order” tab and select “Totals“. Check box the label field for adding a Running Sub Total.  While creating a Sales Order you can add the configured running sub total by clicking the “Add Running Sub Total“. drop down menu.  Here you can see the Running sub Total In Sales Order.  For further help, contact us on help@vtexperts.com. We’ll be glad to be of service.