This question is similar to a project that I am working on:

I am working on an 128-page “show guide” for a convention with many ads inserted (with bleeds), plus articles. I was having a problem with InDesign trying to allow for creep for me and so I changed my document from facing pages to single pages. I do, however, want to have an image spread across facing pages for the center spread. Should I also create a separate file for the center spread or is there a way to tell the native fiile that I want to “connect two pages?”