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Hi Vlady,
To the best of my knowledge, I am afraid it's not feasible to use the Import-Contactlist cmdlet to import contacts into a Subfolder of the Contacts folder of a mailbox.
As indicated in the parameter explanation section in Import-ContactList, the -Identity parameter specifies the target mailbox, and there is no other parameters available to specify a subfolder path. So the contacts can only be imported into the default Contacts folder of the mailbox.
That being said, if you would like to import the csv file into a subfolder, it's suggested to use the Outlook client instead which allows you to select a destination folder. For mode details, you may refer to:
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