The flow chart for conversion is nearly 10 years old
The DGCA came out with newer one in 2012
Please refer to this
http://www.dgca.nic.in/circular/FCL1_2012.pdf
Conversion is a long hard road . You need to get DGCA medicals out of the way first . Obtain a Computer Number and pass NAV Composite and Air Regs and at the same time obtain an RTR License from the WPC
The RTR exams are very hard and passing is dependent upon the whim and fancy of the examiner taking the exam.
Many FAA CPL holders head over to Canada and obtain a Canadian CPL and RT from Canada which they can convert to Indian RT without having to give any exams. Perhaps you could also look at the same option
Another issue you are going to face is the DGCA will only recognise aircraft that are registered in India and have a valid Certificate of Airworthiness
Unlike the FAA the DGCA does not issue a blanket approval ( i.e open rating ) like the FAA does for Single Engine land and Multi Engine land . Every aircraft that you wish to fly has to be specifically endorsed on the license
The PA 44 and the PA 28 are not recognised in India . While the DGCA will recognise the hours they wont issue a license unless you have the bare minimums ( about 10 hours on type ) on an aircraft recognised by them
In India the commonly recognised multi aircraft are DA 42 , PA 34 and P 68 C
Single Engine are DA 40 , C172 , C152
You will need to pass the DGCA tech specific for the same and have 10 hours Dual on each aircraft type in order to endorse the same.