A urgent query as per new companies act

Hello evryone .. Can some on please tell me.. i have four shareholders in a company .. eg. A , B,C & D . where C & D are holding more than 50% stake in the company and they have been allotted shares of the company (MR. C & Mr. D) so the above allotment will be called as Rights Issue or Preferential Rights ..

If possible please give the procedure for the allotment of the above shares.

Thanks alot in advance