Hi Surya,
Planning book depends upon what business scenario you want to fulfill. Logically if you want to create it for demand planning then you need to consider
- Whether it would be used for promotion planning/forecast profiles,
- Then you need to define characteristics which would be available for planning.
- Key figures which will be part of this planning book (input/output or output only)
- You need to assign time bucket profiles for history & future
- You define the data view that is how key figures would be visible.
Also check
Planning Book Design - SAP Library
Adding New Key Figure To Planning Book
For SNP planning book you can copy the standard planning book SNP94 depending upon which functionalities you are going to use. For the same refer to below link.
Interactive Supply Network Planning Desktop - Supply Network Planning Run - SAP Library
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Regards
Rahul