Importing a Carrier list allows you to bulk upload Carriers instead of one by one manually.

NOTE: Duplicates are checked verifying the SenderCode pair. If a file includes records that are duplicated, it won't be able to be imported until those conflicting records are removed.

To do so:

1) Click Integrated Flow / Carriers 

2) Click the Sender where you will add the Carrier 

3) Click the Import button

4) Click the source control to select a file

NOTE: If you don't have the source file, you can download it here: Carrier Import Template

5) Click Import to complete the process