As per the CBDT have already published the notify that the Form 16 Part A is now mandatory to Download from the www.tdscpc.gov.in and must be register the TAN, then can be download the Form 16 Part A. This Notification No 11/2013 
But the Form 16 Part B must be prepare by the employer. This Part B have the details of employee's Salary Data. It is most hazard to prepare the Part B by manually or insert each and every cell in Computer. But if you have this type of Excel Utility which can prepare at a time Form 16 Part B after filling the Data input sheet.In this Data input sheet have all the details of Employees Salary Data.

Click here to download the utility ( Automatic Form 16 Part B which can prepare more than 100 employees form 16 Part B by this one Software)