Hi,
1. I want to design DSO and Info Cube for this Data Source and other, how should I proceed?
A. yes you can create the DSO and IC and Data source.
while seeing the you can design and check the which fields you want put as key fields and in IC how many dimension you want check it after that create the custom data source for all master data and transaction data
Data source - after creating the data source run the info package you will get up to PSA.
2. For Sales Data Source which has 120 fields do I need to create 120 Info Objects and put these into DSO and Info Cube and then do transformation and data updating?
A. first use the standard objects sap delivered if not objects is there create the custom objects.
4. Should I follow a certain naming convention for Info Objects and should I do direct mapping in the transformation?
A.yes you should fallow the some certain naming conversion. ex- 0customer (sap) zcustomer (custom)
5. What should be the best approach for this scenario?
A. first get the requirements how many reports you want develop then fallow the standard processer.
6. Do I need to load or create the Master Data as well?
A. yes you need to create the all master data for required objects.
Thanks,
Phani.