I am hoping to help here. Since it is not clear whether you are an Indian citizen, and/or if you are returning to India after a long stay abroad, or whether you are visiting India on business or pleasure, it is difficult to answer your query fully. But I will try to the best of my ability:

Visitor:
As a visitor, you are allowed to bring in, duty-free, one laptop, 200 cigarettes, 2L of Liquor, and reasonable personal effects. You may also bring in whatever else you want AS LONG AS IT IS BEING RE-EXPORTED. This would require you declare it at customs, they will enter it in your passport, and you can then declare upon exit and leave with the goods (modified or otherwise). Else you would pay customs duty on whatever exceeds your customs allowance.

Returning Non-resident Indian (NRI):
If you are a retunring NRI (for good), you may be able to invoke the Transfer of Residence (TR) rules, which have (considerably) higher allowances for goods you bring in.

Please clarify what your status is, and it will help in providing advice.

~YRS