Hi,
Search the threads on amibroker in traderji.com and you will find one that serves your purpose. I am sure some senior members have done the job. you have to go out and seek for yourself. Here are some off hand hints for EOD data. Some posts show you how to do Intraday. I don't use Intraday so Search and you shall find, ask and you shall not get.
1. Create a new database in ambroker.
2. Download the Bhavcopy from NSE
3. Use the Import wizard in AB for the first time and create a template for updating downloaded NSE bhavcopy's.
4. The above steps are a one time job in future just download NSE bhavcopies and update it accordingly everyday.
Oops. You have also to create a symbol list of all scrips first.
I can help you this far. Hope my pert reply does not offend you.
Bye