Adjusting a histogramm like in Flexsim 5

Hi,

I'd like to adjust a histogramm as I was able to back in Flexsim Version 5 and earlier Versions. Then I was able to set boundaries and divide the data inside them in categories with defined equal intervals.
This feature I miss in Flexsim 7.
Where are the variables that defines which size gets an interval. How can I manipulate the data to get an interval which contains values for example between 0<=20;<=40;<=60; and so on?
I think it is possible by adding a single value to a tracked variable, which is the last value to the upper bound. But Therefor I have to know how these intervals are calculated.

Thanks in advance for your help.

Jörg