I tend to use the HTML option because it gives me more control. If you try that, you enter the [cut] command just above the text you want to be hidden and [/cut] after it. You can have several different cut sections, and if you want them to have actual titles you use [cut text="your title here"].

Edit ... and I forgot that commands are automatically deleted in comments. To use the commands above, replace [ with < and ] with >. Sorry about that.