Have you ever wanted the ability to change your subtheme page layouts or settings on specific pages (like the home page)?
Then you will want to use the Delta and Context modules. These modules make complicated page structure changes possible through the theme settings user interface (UI).
The Delta module allows you to create different versions of your subtheme’s configuration settings. We call these versions, “snapshots.” Delta's primary responsibility is to create, read, update and delete "snapshots" of your theme settings.
We use the Context module to define the conditional situations in which each of your “snapshots” will be used.
Let’s first discuss what the Delta module does, how it can make a Delta snapshot, and what to do with that Delta snapshot after it is created.