Create 'Add Item' button in child table

Hello,
I need to have custom doctype whilch has a child table. I want to add a ‘Add Item’ button (to add multiple items) along with the ‘Add new row’ button as we can see in the Sales Order doctype. Is it possible in custom doctype?

@Amalendu, check this https://github.com/frappe/erpnext/blob/master/erpnext/public/js/controllers/transaction.js#L84

But I guest that it ill be deprecated in v7!

Thank you max, Will try…

i want to remove add row button from child table == purchase order list.
how can i do that.
please say
thank you.