New Themes

[GateKeper]

I like to add new themes to our site, but every time I do this, I need to redo all my templates for all the hacks that have been installed so we have everything, is there an easy way to do this..

for example we have a bottom navbar, when I add a new theme it does not have this, so I have to add this to the template to get it on the new theme.

what is the easiest way to get all my mods add ons, and template changes say from my main theme that has it all, to all the new themes I would like to add...

or is it a manual process, and each theme has to be done individually ?

Thanks