Regarding 1 ,Mr.Marc should explained to you about this case.
Actually PC16/00XX-8D or 8E is your PO number not our number ,we have our own number like PLZ but we won't show you that.
If you mean the PO number in the list ,it will be impossible for DIS to manage it.
One order can't be provided into serveral different ETD/ETAs ,it will cause big problem.
Thus we suggest if you want to order within a same ETA , you could combine same ETA items into one order(like PC16/00XX-8D).
But pls kindly prepare us enough lead time for them like you did every Friday.
Will it be better?