How CVC are backed up from planning area to BW cube

Hi,

I would like to know how data from planning area is backed up to BW cube logically.

In planning area, we have around 80k CVC but when it is backed up to cube its in millions.

So theoretically does each CVC is multiplied by the fiscal period to have so many combinations? Also does key figure has any role to play here.

Please give your inputs.

Regards,

Alok