When I say Group By, I'm referring to a column of values, that I am using to group the nodes. The Group Label Text offers options of ID and Count, ID, Member Count and None - I was hoping that ID would return the value of the parameter in the text field at the top of the Group box, but all it does is place a value of 1, in each group?
Sorry - should say, I am importing data from a spreadsheet to create the graph and using one of the columns as my grouping column.