In Model you create, configure and reconfigure your custom Data Model. See the Data Model section for more information on how to work with Object Types, Classifications, and Reversals.
In Import you upload and manage your source files and create and configure your Import Templates. See the Import Section for more information on this.
In Linked Data you create and configure the linked data resources that you use in your Domain. See the Linked Data section in the Configuration section for more information on this.