Amount calculation at stock entry

Hy Experts

Will anyone help for client script to calculate Amount by Quantity*Labor Rate! (stock entry type: Manufacture)

@NCP Thanks…I followed your script.

frappe.ui.form.on("Landed Cost Taxes and Charges", {
    custom_labor: function(frm,cdt,cdn) {
        var d = locals[cdt][cdn];
        frappe.model.set_value(cdt, cdn, 'amount', (d.custom_qty * d.custom_labor));
    }
});