...
Select Connections and select either User maps or Group maps depending on the map type.
Find the map and select Manage mappings.
Select Import mappings.
The Import user mappings modal appears. You have the option of uploading a file from your computer or from the source connection.
To upload a file from your computer, verify you are on the Upload tab and select Browse. Navigate to the file and select Open.
To select a file from the source connection, click Select from the source connection. Navigate to the file or use the Manually enter path option to enter the path for the mapping file you want to use.Once you select the file, click Use this file.
The screen will read the import file and display the mappings on the screen.
...
Click More Options and select Create user mapping.
On the source side, select Choose.
Select the user and click Use this user.
On the destination side, select Choose.
Select the user and click Use this user.
Click Done to save the mapping. The user map is added to the list on the screen.
Repeat these steps for each exception map you need to create.
...