I know how to do in vim. Select all text and hit I (uppercase i), then start type.
There is also a way in emacs, but I never tried before:

https://www.gnu.org/software/emacs/manual/html%5Fnode/emacs/Rectangles.html

2015-09-29 5:30 GMT+02:00 Nick Dokos <ndokos@gmail.com>:
Xebar Saram <zeltakc@gmail.com> writes:

> Hi all
>
> im looking for a simple way to convert a simple list of lines (i can
> mark it first if needed) each to a orgmode header anyone has such a
> way?
>

Maybe I'm missing something, but can't you just add asterisks in front
of each line? Maybe with a keyboard macro? Or even a sed script?

There's a reason that org files are plain text.

Nick