When similar profiles exist in the same file, MtC will mark all of them as possible duplicates.
Steps to Batch Import Multiple Files
Import files
Wait for the import to finish
Click the "Filter" button
Scroll to the Tags, and check the "Possible Duplicate" tag
(Optional) Sort by name to be sure that profiles from the same file are next to each other.
Toggle "Multi-Select" mode
Select any of the duplicates which you would like to delete Don't delete all, because Match the Cut marks both the first profile and any duplicates with the tag so you can pick which one you would like to keep
Click the "Delete" button
Now that you have deleted any duplicates you don't want: you can remove the "Possible Duplicate" tag from all the remaining options
Click "Select All"
Click "Tags"
Uncheck "Possible Duplicate" to remove the tag from all selected profiles
You have now completed the possible duplicate workflow