Make item with attachments keep previous damage on crafting table

I would like to make an item that has attachments, the idea would be that you just combine the item in the crafting table with the supposed attachment and give the combination, the problem is that the item that contains the combination would be a totally new item which would reset the item damage, which would not be very consistent with the mod ideia, I imagine that there is a way to do it through procedures or nbt tags, But I don't know how to start