There are a few different locations in your model where you can import data. In most cases, you'll need to be a Workspace Administrator to set up and run the import. Imports on a dashboard are the exception since they can be run, but not set up, by end users.
You can import data into modules, lists, and versions. In Blueprint view, you can import line items into modules. The source data for these types of imports can be stored in another model or an external file.
You can also import a list of users from an external file.