Are you trying to have multiple mods loaded at once?
The only way to do this would be for your main STimeCycle to launch all the mods.
Give a mod a custom name, like "GirlsToBoysDorm.lur", put it in your Scripts.img, then edit your STimeCycle and add this:
LaunchScript("GirlsToBoysDorm.lua")
This'll require some basic knowledge of Lua.