LTCG on gifting property sale proceeds

First calculate your LTCG.... Pay the tax liability.....

The balance amount you may gift to your parents (rather good idea), without any further tax liability. Transfer the amount by banking channel; & make gift deed.

can i add my parents name while buying a new property will i be able to save complete LTCG

Yes, if you buy new house property within specified time limit, you will get deduction u/s. 54 of IT act, and not your parents. There is no harm if you have any joint owners, be it your parents, but investment should be yours.