What is a Subcatalog admin?
Subcatalog admins have access to, and can make changes to, only the subcatalog in which they are added as an admin. Though your admin access may be limited to a specific Catalog or subcatalogs, your admin functionality is the same as given to full Catalog admins. For each Catalog, no more than two subcatalog admins are recommended. Canvas has additional documentation on how to use Catalog as a subcatalog admin.
Subcatalog admins are expected to:
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Create and maintain course listings
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Add instructors to courses in Canvas via the Canvas Request System (CRS)
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Manage the Catalog entries and settings for the courses
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Help instructors and students access their Catalog sites
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Can choose to set up branding and certificates.
Catalog URL
The required format for Catalog domain URLs is: umsystem-<unique_name>.catalog.instructure.com
Do not make any changes to the prescribed domain name format. When a course listing is live, any changes made to this domain URL will break existing links that your users might have already bookmarked/saved.
Branding/Customization
The subcatalog admin can make and customize their own branding for their Catalog site (see Fig. 1). Other customizations include personalizing the emails that go out to the users.

Figure 1: Customization options in Catalog
Canvas campus and vendor resources