How to add new field "free qty" which searching batch number in delivery note item child table

Hi all,

Thank you so much for the awesome ERP.

I have a query regarding the customization of the delivery note. In the child table, now while selecting the batch number, it is showing some filter options for the batch.

I want to add a new field called “free qty” for that particular batch no while searching.

Now it is showing other options like Unit, MFG, Expiry Date.

I am attaching the screenshot for reference.

Please help me in adding this customization.