Dear Keerthi,
There are two aspects of Pay Slip. One is due to statutory/legal compliance, the other is to maintain the salary slip contents in a Tax friendly manner. You have not stated minimum-maximum amount of salary.
If salary of most staff is under taxable limit. You can add Medical Allowance also. You can start some re-imbursement, LTA, Vehicle Fuel/Maintenance policy. This will reduce the Tax liability of individuals.
Note Conveyance Allowance of Rs. 1600/pm is tax free. Similarly there are certain limit for HRA also.
Before regulating the contents in the slip, pls analyze the tax limit/rebates also for each item. Since Salary Slip format is a strategic and long term decision, moreoverit involve Statutory and Legal aspects. So it is advisable to have proper Home Work keeping in view all the points.
Being a professional HR person don’t take any decision which u need to revert in future (at least due to your mistake/s.