With a LAYOUT DATALATTICE, this is not currently possible. With a LAYOUT LATTICE, this is possible using a LAYOUT GRIDDED in the cell headers. A simple example is below.
Thanks!
Dan
[pre]
proc template;
define statgraph multiheader;
begingraph;
layout lattice / columns=2 columngutter=10;
cell;
cellheader;
layout gridded;
entry "Line 1";
entry "Line 2";
endlayout;
endcellheader;
layout overlay;
scatterplot x=age y=height;
endlayout;
endcell;
cell;
cellheader;
layout gridded;
entry "Line 1";
entry "Line 2";
endlayout;
endcellheader;
layout overlay;
scatterplot x=age y=weight;
endlayout;
endcell;
endlayout;
endgraph;
end;
run;
proc sgrender data=sashelp.class template=multiheader; run;
[/pre]