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The basic procedures outline how to order an opt-in resource when you have 1 one order for 1 one e-collection. The multi procedures outline two options for ordering when you have a single price being paid (ie. it is not broken down by e-collection) for multiple e-collections. Within each of these procedures, there are options to attach migrated orders to your new order, add local e-collections, and make the e-collections discoverable should your library wish to do these things.
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A TS Open Forum was hosted which included a demo of the basic ordering procedures and some discussion of the options. The recording (demo begins around 10:30) and chat transcript are available for reference.
Additional information and instructions from ExLibris are also available on this page.