How to transfer share in one DMAT to another DMAT account ?
You can transfer shares from one a/c to another demat a/c just the way you can transfer money. However, you will be charged with some amount (something like 0.05 percent) when you “take the shares out of” a given demat a/c (there should not be any charge at the depositing end). Again, there may be difference between service providers in this aspect. As for closing the a/c, you just need to tell them that you want to close, the way you do in case of a normal bank a/c. Using the trading a/c by one service provider when you have the Demat a/c with someone else – this also should be possible – unless sharekhan made it a “package” offer (like all or none). If I remember it right, Sharekhan folks allow you to do so. You may just call them and check.