You should be able to do that. When you choose File > Export > EPUB (Reflowable) or EPUB (Fixed Layout), name the EPUB for your first layout. In the EPUB dialog, set the range to be the name of the layout. Only those pages will be exported to that named EPUB.
You're reading the title, Steve. I should have changed it when I moved it from the EPUB forum.
The OP is asking about moving alt layouts to new INDD files.
Just changed the original title.
1 person found this helpful
This is also possible:
You would have to already have an InDesign file created and named for each alternate layout containing one page. Then in the InDesign document with alternate layouts, selected the pages of the first layout on the Pages panel. Choose Layout > Pages > Move Pages. In the Move Pages choice the name of the alternate layout will appear. Select the name of the document you're moving them to. (After doing so, remove the blank page at the beginning.)