Firstly , you need to upload the cost centre data to MDG hub. For this you could use the MDMGX in source system(system where the data is currently available) and DIF in MDG hub. If you have huge number of cost centres , then file upload is not a very useful tool.You have to first upload the cost centres. Once this is finished you have to again upload the descriptions.You can't do this at the same time. But DIF provides more flexibility like the cost centres and descriptions could be uploaded at same time ,the data upload is scheduled as a background job , it comes with a useful log etc., Note that this results in upload of only the cost centre data , but not the hierarchy data
For uploading the hierarchy data , the report KBAS_MDGF_SET_DOWNLOAD has to be used in source system((system where the data is currently available) to download the hierarchy data in text files. Then , you would have to then create a blank CR in MDG and use the file upload to upload the data. You could check the document
Using the Master Data Management Generic Extractor (MDMGX) for Initial Load in MDG-F
This would result in hierarchy data being created in CCTRH..>CCTRG.....>CCTR
Regards,
Raghu