Test whether or not a named SeriesCollection exists?

In part trying to solve a larger problem I am trying to find out how to see if a SeriesCollection that has been named exists so when the corresponding toggle button it clicked it turns on or off the correct corresponding dataseries.

When I create a series I use something like:

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Where the range "tblJim[Quizes]" contains the quiz scores which are the data series pointes and "=Data!$C$6:$C$35" has the respective dates.

When that toggle button is clicked I need to test if the SeriesCollection "Jim" exists so if it does I can delete it and if not, create it.

Also, as much as I hate to multi-subject but usually do anyway, I am wondering if there is good example of doing the same ends by a different strategy - a chart with everyone on it and by applying data filters to the dataset I would turn on and off people's data. Thoughts?

No, I hadn't... I have become familiar with pivot tables (though not completely comfortable), but it seems this could be a very nice solution. Thank-you!