In order to eliminate the data you don't want, you'll need to have a field you can use to differentiate the data you want from that which you don't.
You say that the report heading is different for each section. We'll take advantage of that.
Create a template to trap the page header. When you're creating page header templates, it's best to not use the first page of the report for the template sample.
Assuming once more that the headings read "Revenue" and "Revenue Adjustments", setup a field within the template wide enough to capture the text "Revenue Adjustments". Be sure to define this a page header template. We'll name the field "Revenue Type".
Verify the templates to make sure everything's OK.
You should be left with only the data you want.
Please let us know if this is a good solution for you, or if you have further questions.