Applying filter to one Value in Pivot?

[typo19]

[FONT=&quot]Hello,[/FONT]
[FONT=&quot]I am trying to create a dual axis chart; a bar graph of total calls with a line representing percent of calls that are during business hours.[/FONT]
[FONT=&quot]My source data is a list of calls that have the following information: session ID, duration minutes, business hours?(y/n), and OS type.[/FONT]
[FONT=&quot]My thoughts is to have a count of session ID to calculate the total number of calls, and then filter a count of business hours? to only include the Y values. The problem i'm running in to is that it also filters out the count of session ID instead of leaving it alone.[/FONT]
[FONT=&quot]Is there a way to do this that I'm not thinking of? Thanks for any help!![/FONT]