Engineering BOM and production BOM-very critical help

Hello All,
I am working for a client and below is the requirement, please guide me.
1) Customer has 2 department here one is engg and other is production as usual.
2) He needs BOMs only for 2 purposes a) For R and D  b) Production.
3) He needs any changes in engineering and production to be reflected from certain specified date.
4) He says he will raise ECN for every change.
Now my questions are:
1) How to copy any changes done at later stages from engineering bom to production bom at specified date. Can ECN automatically do this?
2) what are methods  to copy any fresh E bom to Production bom also?
3) Can ECN once approved automatically update changes in BOM by itself or does customer cumpolsarily need to take ECN and manually change E bom and then P bom.
Please suggest if any better model can help.
Regards,
satish

Hello Adler,
That was good response. Here any of both situations can appear. So can you help me in knowing the procedure how to do the same in both cases
Also below are my pending queries, any one please help
1) He needs any changes in engineering and production to be reflected from certain specified date as per date he mentions
4) He says he will raise ECN for every change.
Now my questions are:
1) How to copy any changes done at later stages from engineering bom to production bom at specified date. Can ECN automatically do this?
2) what are methods to copy any fresh E bom to Production bom also?
3) Can ECN once approved automatically update changes in BOM by itself or does customer cumpolsarily need to take ECN and manually change E bom and then P bom.

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