Thank you very much for your help Sanjay. I will definitely read up on DATALATTICE/DATAPANEL, but your statement "As long as the plots in each cell are identical" tells me that I should stick with the current method.
As a follow-up, there is the possibilty that the two original data sets will not have the same number of records so that after the rename and merge there are "extra" records with missing x,y and group values in the data for either the top or bottom graph. While this does not appear to effect the graphs, it does generate a phantom line in the graph legend that has no label value attached (I assume because these are the records where group is missing). Is there a way to get rid of this phantom value in the legend box if the data set being graphed cannot be conditionally executed via GTL?
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