Hello Ashok,
When you run the table splitting preparation the R3ta tool is called and this will create the WHR files. If you run the preparation with just one R3ta then it is going to run for some hours, depending on the number of tables to be split. Instead, if you run multiple R3ta processes then the job will be done quickly. Again if the system do not have sufficient CPU and memory then there is no point in having multiple R3ta processes triggered. if the R3ta processes are more then the duration taken for the table splitting will be less (if the hardware resources are sufficient).
For the package split, last time I did the split I went ahead with the automatically populated values. Don't have the system to check and I don't remember it.
Regards
Reagan