How to split Panel Header Labels in SGPANEL

[SUNNY2409]

I want to split label for each panel header,  

proc format;

VALUE $ CHE
'a' ="AAAAAAAAAAAAA(*ESC*)(100mg N=638, 200mg N=320)"
'b' ="BBBBBBBBBBBBBB(*ESC*){unicode '000a'x}(100mg N=638, 200mg N=320)"
'c' ="CCCCCCCCCCCCCCC(*ESC*){unicode '000a'x}(100mg N=638, 200mg N=320)"
'd' ="DDDDDDDDDDDDDD (pompholyx)(*ESC*){unicode '000a'x}(100mg N=638, 200mg N=320)"
'e' ="EEEEEEEEEEEE(*ESC*){unicode '000a'x}(100mg N=638, 200mg N=320)"
;

run;

proc sgpanel data=Test_all noautolegend;
format EPTCD $Ept. subgroup $CHE.;
panelby Subgroup/layout=panel spacing=0 novarname columns=2 rows=3 sort=ASCENDING ;

styleattrs datacontrastcolors=(black);
scatter x=difference y=EPTCD / filledoutlinedmarkers group=Subgroup grouporder=Data xerrorlower=lcl xerrorupper=ucl
markerfillattrs=(color= blue) markerattrs=(symbol=squarefilled) markeroutlineattrs=(color=blue) ;
REFLINE 0 / axis=X;
inset txt /nolabel POSITION=bottomright TEXTATTRS=(Family=Arial Size=6 ) ;
colaxis label="Difference (95% CI)" values=(-20 -10 0 10 20 30 40 50 60 70) offsetmin=0.05 offsetmax=0.05;
rowaxis colorbands=odd label=" " offsetmax=.2 DISCRETEORDER=data reverse ;

run;

[whymath · Accepted solution]

How about using two variables in panelby statement?

proc sgpanel data=sashelp.prdsale;
  where product in ("CHAIR" "SOFA");
  panelby year product/ spacing=5 novarname noheaderborder;
  vline month / response=actual;
run;