To load data form one cube to another cube, we were using calc scripts to copy data from one cube to another, either to BSO to BSO or mainly BSO to ASO.
Now we have one smart feature with new versions and with cloud applications like EPM Cloud Planning.
That is Smart Push.
We can push data from one cube to another cube i.e either BSO to BSO or BSO to ASO, we can select Smart Push option in the data forms itself.
We can select this option in Simple Data form or Composite Data form also.
https://docs.oracle.com/cd/E57185_01/AGOHP/ch10s03s09s02.html
Thanks,
Madhusudhan