Hi Vijay,
For these,you may convert planned order into production order partially i.e, what ever the quantity you have to manufacture. Suppose, if you convert the whole qty as single production order, you should do the confirmation type with "Partial confirmation" and order status shouldn't be the TECO. You can use the same production order for confirmation until unless you complete your whole production order qty with confirmation type as "Partial". Test it.
Thanks