How do i add new field in Update Items from Sales Order

What field are you trying to add? Is it available in the drop down when you press the pencil icon?

HI
Yes i want to add field which is Bom in every line item

I tried to change the Dialog in erpnext.public.js.utils.js but its not working

That would be difficult I would imagine, tbh I don’t know what ERPNext does when you submit an order item with BOM.

Might be easier to submit, cancel and amed?