Till date, on the basis of chartered accountant you can not avail exemption in cs training. However, if you have work experience of secretarial matter then you can apply for exemption in cs training with CS institute.
First of all i congratulate for cleared your CS Professional Programme. I think you have experience in Finance Department as well as some other departments for some years. Through this you can claim exemption from the practical training. The ICSI may give exemption to the maximum of 9 to 12 months, in case without secretarial dept experience. Just apply for the exemtion. If you have luck you can get more months as exemption. All the best.