Hi,
CL cannot exceed more than 12 days in a year. It is entirely the company's policy whether they can be carried forward or not, but generally, it is not a common practice.
PL can be accumulated and encashed after the accumulation of a certain number of leaves. As per the act, PL should be 1 day for every 20 days of working, but to be eligible for PL, an employee must complete 240 days of work.
Please ensure you are not mistaken regarding PL or CL.
Suresh