The easiest way to add mappings to a project at scale is via a CSV file. CSV mappings are added to a project as individual transfers/move jobs and you can then treat them like any other mappings.
Uploading CSV file
Under your project, click + Add User/Drive. Select Import Transfers from CSV file.
CSV files follow a source, destination format. The CSV file _must_ be in UTF-8 format and have proper headers and escaping.
An example CSV file is:
CSV uploads support a variety of source and destination types and you must define the entry type with a type prefix. All mappings can include a subpath.
CSV format prefixes
|user:<username or email>||user:email@example.com|
|teamdrive:<team drive name>||teamdrive:My Team Drive|
|teamdriveid:<team drive ID>||teamdriveid:0AI2ezk6QbPvvUk9PVA|
|sharepointurl:<document library url>||
For help with CSV mappings, get in touch with support via firstname.lastname@example.org