Limiting Sub Summary Reports

Title

Limiting Sub Summary Reports

Post

I am relatively new to FileMaker Pro.  I am using FM 11.

I want to limit a Sub Summary Report to only a portion of my DB.  The report I have written works fine - for one month.  I expected to be able to limit the report using a simple "Find" command to create a "found set" of my data.  Instead, when I add a second month's worth of data the Sub Summary Report creates a report for both months regardless of how much I try to limit it.

I understand I can add another Sub Summary part to break out the months... but is there an easy way to limit what the Sub Summary Report is "summarizing"?