Woocommerce: Dont remove item from order if admin set quantity 0

I create a new role called (supplier), This role can only see orders and then go to (shop_order) page, he sees all order that I assign it for him.

This is code for this:

Now I need this supplier to see orders details, if some items not found in his store, I need to add 0 into quantity, For example, this item I need to add 0 :

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But if I add 0, its remove from item, So here I don’t need to remove it, I need to still in item and set quantity 0.

How can do that?