Please go to  Collectors --> Account Collectors --> Relevant Collector Name --> Accounts -->"Import Account Mappings"

Import Account Mapping can be used to do the mappings of multiple orphan accounts automatically.
 

• You can use csv file with datapattern-  "accountName","userAttribute"

• Click on Import Account Mappings select the file created in the previous Step.

• Click OK to finish the import. Below message shows successful import of the mapping file.