In analyze->Distribution is it possible to create a CDF plot for the data being looked at. However, is does not seem possible to using a "grouping" feature to create mutiple trendlines on the same CDF graph, similar to what is possible in Analyze->Fix Y by X.
Arrange your data so that the values for all groups are in one column (say, Data) with the group name identifying each row in a second column (Say ID). (If you have a bunch of columns in a table, use Tables>Stack to get the data in this form). Then do Fit Y by X with Data-->Y and ID-->X. From the resulting platform output click on the red triangle for Data and select CDF Plot.