I am using S&T2010; I don't know what you are using, Bill. But what I see is as follows.
When I import the data from an Excel spreadsheet, they come in as Pushpins, not Route Stops. The only way I can see to get those addresses into Route Planner is to convert the Pushpins to Stops, via Route>Add pushpins as stops. When it does that, it only includes the first data field of the pushpin. For instance, if the first line of the pushpin bubble is "Joe's House", then that's all that will show in the Route Planner. Call that a limitation of S&T. However, the good news is that the addresses, including city and state but not ZIP, DO show in the Driving Directions in square brackets [], and will show in the printed directions. If your first column is the street address, then that will be repeated within the brackets, so it might be better to name the stop on the spreadsheet.
IF this is not good enough for you, the only work-around I can think of is to then rename each of the stops which of course may not be too convenient.