Hello Ajeet,
Greeting of the day,
Good question, my suggestion would be following:-
1) Get the HANA view which shows the Sales per profit center (should be standard) and then copy this and create a calcualtion view with your ratios
2) Or you can use the HANA live content and to get the ratio, use another table and put the processing logic in the reporting tool of BO.
3)In case you are on S/4 system, the source S1 should be updated real time (need to have embedded BW) and then use this.
Hope this helps, personally i like the option 1,
Check Sales Analysis Fiori app and the back end view it is using 
You should get your answer
Regards
Rishab