populating data to newly appended zzfields in the datasource

Hi,

I have added 2 zzfields to the extract structure ? its working perfect ? Data showing it ECC and BW. Now I know how to do a repair full load to bring the historical data for these 2 fields to the DSO. But my question is, We have the historical data of 5 years in the infocube and how do we get the historical data for these 2 fields in the infocube ? I mean as the DSO has the overwrite feature, it will pull all the historical data with the repair full request from ECC, correct ? But how do we load this to the infocube. We do not want to delete the existing data in the infocube, is it possible without deleting the existing data ? Please help.

Thanks

DR