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I want to change the format

From:
Sample.txt

 Count Data
 1 C0263/Pre-approved Auto Load BC
 1 C0263/Pre-approved Auto Load BC Holders
 3 C0268/Pre-approved Auto Loan

To:
Output.txt

 Data Count
 C0263/Pre-approved Auto Load BC 1
 C0263/Pre-approved Auto BC Holders 1
 C0268/Pre-approved Auto Loan 3

awk solution:

awk 'NR==1 printf "%4s%-44s%sn",FS,$2,$1; next 
 f1=$1; sub(/^ *[^ ]+ */,""); printf "%4s%-44s%sn",FS,$0,f1 ' Sample.txt

The output:

 Data Count
 C0263/Pre-approved Auto Load BC 1
 C0263/Pre-approved Auto Load BC Holders 1
 C0268/Pre-approved Auto Loan 3

Assuming the input data is in the file datafile.txt and you are using a POSIX shell, you can say

sed -e 's/^s*//' -e 's/s+/:/' datafile.txt | while IFS=':' read a b; do
 printf '%-30.29s%sn' "$b" "$a"
done

The sed command will (1) delete any leading spaces, then (2) replace the first occurrence of one or more spaces with a colon; the result is piped to a while loop which reads two fields separated by a colon then prints them nicely.

If the input data comes from a pipe then delete the datafile.txt argument and pipe it into sed.