When working on automation workflow, it's often easier to work with CSV format because it's easy to use and easy to parse.
you can export xlsx
file to csv
too and play around with it.
for example you have line-separated data like
username;password;email
reakl yuki;qwerty;[email protected]
you can filter to just show the email only:
sed '1d' | awk -F';' '{print $3}' filename > manipulated.txt
reference: