You can do (under current rules which may well change very, very soon) CPL(H) exams for the issue of a CPL, the IR(H) for the issue of an IR(H). This can, with the required multi-crew experience etc, be "upgraded" to an ATPL(H).
The CPL(H) exams are a separate set of exams which, for example, combines general navigation and radio navigation into one exam instead of two.
However, given that the date of the change from Amendment 3 to Amendment 6 is not yet confirmed (I think?), you might be best advised to go for the ATPL(H) exams and get your IR within 3 years.
Cheers
Whirls