So there is a process I see in my activity monitor and I can kill it. Due to whatever, another process is set to restart the killed process every 8 hours and it can not be changed. I am looking for a macro of sorts to have the killable process killed every 8 hours. Mmmm?
Are you able to manually kill the process using the kill command in terminal?
I've setup the scheduler to kill user jobs that run out of control by noting the program name and the time it's been running and how much cpu it's eating up. I usually get that by running the 'ps' command and piping it to awk because it can do the if/then/elses needed to see if the process is truly the troublemaker and needs killing.
In your case, if it's always a single program that needs killing, you can simply schedule the following command every 8 hours via cron:
8 7,15,23 * * * killall "program-name-to-kill-here" >/dev/null 2>&1
Translation: at 8 minutes past 7am, 3pm and 11pm everyday kill the program between double-quotes" and send the feedback to nowhere...
You can read the man page for crontab from terminal using: man crontab