A Question About Shell

I have a shell script,
It is so large,
so I do not want to run it at a time.
instead i 'd like to make it into some small scripts file
and i have already make some mark in the original file where need to be separated
and what to do next?
Thank you.

If you mean BASH shell script, you could divide your script into several functions/procedures, put them in several files and then use 'source /path/to/the/script.sh' command in the beginning of the main script file to include functions/procedures that will be called there.