The Site Layout editor can be used to manage the content on your site. Content is divided into sections, and you can create subsections of each section, much like directories and subdirectories on a disk.
Selecting a section on the left shows information about it on the right. Click "Create New Section" to create a new top level section, or select an existing section and click "Create subsection" to create a new section under the existing section heading.
Sections come in three flavors: Product pages, content pages and links to foreign pages. In future releases of Interchange, you'll be able to control many page attributes without having to edit the templates by hand.
Product pages are for listing items in your inventory. Generally, you'll create a section for each kind of item in your store, so that visitors can browse your items easily. If you have many kinds of items, you may want to list their sections together under a "Products" section. When you've selected a section that is a product page, you will be presented with a list of items in that section and options for adding and deleting items in that section. Deleting an item from a section doesn't actually delete them from your store; use the "Items" page for that.
Content pages are pages which primarily contain information about the site and don't list any items. You can choose from pages you've uploaded via the file uploader.
Links to foreign pages provide an easy way to link to another site.