Disable specific httpd service at boot time

On RHEL-8.10 I have several projects which use httpd(Apache). Manual creation of necessary systemctl related files have been completed. Only want one HTTPD service active and running at a time. Disabled previous project HTTPD service and have to manually start current project HTTPD service. Do not want to delete all systemctl related files but cannot stop previous HTTPD service from being run, even though serivce has been disabled, at boot time and getting current HTTPD service started at boot time instead.