Multiple Template Prefixes

[RocketFoot]

I have a new theme that needs to use a different forumbit_depth2_forum template other than the global one we created for the default theme...

How can I specify a certain theme to use a certain template?  I still want to keep the custom template active in my default theme.

See screen caps...mobile theme is not pulling the right forum icons as well as layout issues with the banners...

I think what I need to do is edit the mobile theme to point to a different forumbit_depth2_forum template but where to edit this at?  i could create a new template and call it mobile_forumbit_depth2_forum or something like that.  I just don't know how to do such a thing.