I have seen these posts before but now that I need that I can't find it. Custom-conf is used for templates for new sites, but I know there is somewhere that we can put things like /ispconfig/web/sites/templates/web_domain_admin_list.htm so the next update does not overwrite my customizations. Thanks!
The conf-custom function exists for config file templates only. The html file that you refer to can be preserved by putting it into a folder web/themes/yourtheme/templates/sites/web_domain_admin_list.htm where "yourtheme" is the name of the theme that you use.
Till, After /yourtheme/ in your example you have /templates/sites but in ispconfig its /sites/templates as the order, just double checking they are supposed to be reverse from their original location. Thanks for the excellent support. The more I use ISPConfig the more I realize how brilliant it is.
Yes, they are reversed as all templates of a theme reside in the templates sub folder of the theme and templates that are specific to a module reside in a subfolder with the name of the module. so its themes/yourtheme/templates/module/template-file.htm