Upload Territory attribute value(like Postal code , country and Account id) from excel in CRM

Hi,

I am working on the Territory management. My requirement is to upload the values for the standard attributes like POSTAL CODE , COUNTRY and Account Id for a Territory with the help of excel file. File could contain ranges or single values for the attribute

Can anyone help me on the requirement , i have used some FM's to test it but none of them are working. Verison of CRM is 7.0

BAPI_TERRITORY_ATTR_CHANGE

CRM_TERRMAN_TERRITORY_MODIFY

Please share your idea's, i am new to territory management. Do we have any standard report which we can use for the functionality. or would i need to design a custom program for it. if yes , then how should i proceed towards it.

Regards

Nishant