Is it possible to add a digit in front of the exiting 4 digits in the IP phone field and or Office field in Active Directory with AD Manager?

Is it possible to add a digit in front of the exiting 4 digits in the IP phone field and or Office field in Active Directory with AD Manager?

We have a new phone system and need to add a 7 to the existing 4 digit number already in the IP Phone field and the Office field in Active Directory.   Is there a way to use AD manager to do a bulk import to add the 7 digit to the existing 4 digits in the field?
 
Thanks,
 
Steve

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