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This description is a bit diffuse. Tryawk -v COL=$ColumnNo -v SRCH="$PPK" -v REP="$NPK" '
{FS=OFS="\""; $0=$0 # recalculate fields based on " delimiter
...

It looks like you're doing well.

The script sets IAm to the basename of the name of the script. The shell expands $0 to the pathname used to invoke your script. Let's assume your script is named...

Perhaps something like this would be a good starting point:
#!/bin/ksh
IAm=${0##*/}
if [ $# -lt 2 ]
then printf '%s: Not enough operands\n' "$IAm" >&2
printf 'Usage: %s file...

Another awk solution, that doesn't need two times the /END/ expression:
awk '/BEGIN/ {block=1} block {str=str sep $0; sep=RS} /END/ {block=0; if (str~/Amit/) {print str} str=sep=""}' file

$ awk ' /BEGIN/,/END/ { str = str ? str "\n" $0 : $0 } /END/ { if( str ~ /Amit/ ) { print str }; str = "" } ' file
******** BEGIN *****
My name is Amit.
I am learning unix.
***** END *****

...

This command prints everything between a line containing "BEGIN" and one containing "END", regardless of what is in between.

Your problem is, if i have understood correctly, is to only print these...