Issue regarding joint shareholding

Hi Everyone,

Say, A and B are joint shareholders in a Private Company. Now A wants to transfer those shares to B fully, but after he dies. While alive, he/she wants to hold the shares jointly. Also, A wants that his/her other heirs have no claim on his/her shares i.e. only B gets the ownership of shares. Can anyone specify any provision under the Companies Act, other than transfer or transmission. Can A make B his/her nominee?

Thanks & Regards

DEB