Should I Keep Them On Training Till Three Months ?

I am working in a manufacturing company.our company employee turnover is too much high in sales department. as some of employees used to left within 1 or 2 month. As per our company policy we use to deduct ESIC & PF from first month of beginning ,so its huge amount is waste as in PF & ESIC if they left within short time.Can i change policy that we can deduct employees PF & ESIC after three month of completion?? can i put them in training as a part of job for three month with only gross salary ?after continuous service will put them on payroll.

Dear Patelji
You have stated that as per your company policy you have been covering all Employees from the date of joining.This is fine as per PF/ESI Act
Employees leaving with short service can not be the ground to change the policy.please inform Employees to get their PF Account transferred to Their new Employment.ESI Insurance Number allotted in your Employment can be continued in new Employment.
Even if you are Authorized to change this practice, pleased do not resort to any changes as proposed by you.As Employer you have to cover under EPF/ESI from the Date of joining.please do not worry about waste of money.try to find out factual reasons for huge Turn over & put proper systems in place to control the same.