How can I include Invoiced Items on Payment Entry?

Hello @ArundhatiS, Thank you for caring to respond. I discarded my previous script and been looking for it. Meantime I’m looking at the closest method I’ve found and will revert soon as I get somewhere:

frappe.ui.form.on("Sales Order", "quotemaster", function(frm) {
frappe.model.with_doc("QuoteMaster", frm.doc.quotemaster, function() {
var qmtable = frappe.model.get_doc("QuoteMaster", frm.doc.quotemaster)
$.each(qmtable.items, function(index, row){
d = frm.add_child("qm_items");
d.item_code = row.item_code;
d.qty = row.qty;
cur_frm.refresh_field("qm_items");
})
});
});

Just dont understand QuoteMaster and quotemaster in this context.

Thanks.