This is quite easy in version 2.0 but if you are still on version 1.0, and most people are, then it looks like you need to use one of the standard grouping techniques. See the first post in this forum for a good tutorial on this. You will be grouping the queues based on the date but instead of for-each against the individual groups just use sum(Total). If you're still having problems then come back with more details.
Joe (Microsoft MVP - XML