It simple (although it usually must be done by hand for most of the divisional charts-I think some software will do it for navamsa)
-for each divisional charts, note the placement of the 7 planets and the lagna of the divisional chart, then determine the sarvashtakavarga bindu count for each sign in that chart (I like using the table in chapter 3 of Aditya's "Dots of Destiny" for determining sarvashtakavarga bindu totals, whether in the D1 or for the divisional charts)
Is there a book available for it?
Regards