Text Above and Bellow Selected Lines

[blueray]

I am using Geany.

These is a option Edit > Format > Send Selected To > Set Custom Commands

Here, for example if I want to sort selected text, I just use sort command.

What I want this (Set Custom Commands) to do is put .... above and bellow my selected line/s.

For Example if I select the following lines,

touch sample_file.txt
ls
rm sample_file.txt
ls

Then go to Edit > Format > Send Selected To > MyCommand

I am expecting to get:

....
touch sample_file.txt
ls
rm sample_file.txt
ls
....

Is there any way I can achieve this?