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I hope you have code to store the contents of file "amended_file_01" into variable "amended_file01"; after which a minor adjustment to your sed one-liner should do the trick:

sed...

May be you missed a new-line...but then that also depends on the OP's requirements...

awk '{ sum += $1 } END { printf "%012d", sum }' totals.txt

Hi.

An alternative awk solution:
#!/usr/bin/env bash

# @(#) s1 Demonstrate filter for first and last matches.

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
#...

Please check below

1) I am assuming we need to print only first occurrence of a 00 entry and remove remaining all.
2) Remove all instances of an entry starting with 80 except last one
3) Keep...

Is this what you want...?

awk 'NR==1
s=0
NR>1 && !/^00/
/^00/{s=1}
END{if(s){print}}' file