Thank you Unnivelanji.
I know how to create GL Master Data manually. I am familiar with all functionalities as well. I never got clue about next step after system copied gl account from INT?
1. I entered tcode EC01 press copy button
2. I entered 1000 in "from field" and _ _ _ _ in "to field". Now if you create your own chart of account then how you can assign because system wont ask you about chart of account preference
3. I pressed yes
4. After this we make assignment to company with tcode ox16.
Now what to do next? If I create new Chart of Account and then assign I will be asked to reset data. So not clear what to do with GL accounts and account group after this config