Hi Ahmed,
I think arturo senosain had hinted you the way to go about it.
I just have one thought to offer, though it is not an answer to the question you have asked, yet it could be relevant.
If you have Delivery Date and Billing Date as Segment Level Characteristics, your system performance will be severely hit in the coming near future, because of the the number of Characteristics PA Segments that would be created. If you decide to have them as Non Segment Level Characteristics, they would be in Line Item table only and thus not so helpful.
Instead, If i were you, i would try to build a Custom report, that would give me all the details i need.
The Principal advantages would be
1) As it is rightly pointed out above, the chances of getting all kinds of different SD scenarios would be very difficult (rather near impossible), and they are subject to changes. And whenever there is a change or introduction of a new scenario, you will have to change the Custom Logic in KEDR and transport.
2) If it is a report, even if it fails, you can always correct it and the impact of it will be significantly (honestly, the word to be used is "relatively"....when you take into account your Manager...if you know what i mean 
) less.
Best Regards
Surya