Is it possible to add a column with the remaining quantity material under the Used Material inside a WO (Work Order)?

When selecting materials, the quantity is visible on the listing page for you to check. Adding this field directly to the 'Materials Used' tab wouldn't be advisable, as it may result in incorrect data when there are changes in inventory.

This wouldn't be a reliable way to use the feature.If material movement is desired to occur only after the stock reduction, you can utilize reservation management in material request and transfer.

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During the use of materials needed by businesses, it is important to reserve materials in stock for both critical stocks and priority tasks and to use them for such tasks. It aims to create material movements according to reservation rules in material request and transfer processes, both through web and mobile applications.

source: https://docs.bimser.net/docs/Legacy/BEAM/user_manuels/malzemetalebivetransferinderezervasyonsistemi