Data upload for activated business content

Hi All,

I have to load dummy test data from ECC sandbox to BI dev for Grants and both these systems are not connected, Therefore in order to do this, the approach I think I can use is, first go to Rsa3 in ECC Sandox, pull the records as a .csv file, then do a flatfile upload of the data in BI. I have already activated the business content for Grants in BI, I am not sure how I can use the same DSO, Infocube, DTP.etc for this flat file data upload, can anyone advice please.

Thanks a lot!!