Try this:
with cte (orderno, createddate, invoiceamt, qty)
as
(
select orderno, createddate, sum(invoiceamt), sum(qty)
from mld group by orderno, createddate
) select orderno,
(select top 1 invoiceno from mld where mld.orderno = cte.orderno),
createddate, invoiceamt, qty
from cte