Hi:
I do not know whether there's a way to specify a custom denominator in the EG wizard or task. You may have to generate a simple N and PCTN table and then modify the generated code to use a custom denominator with the < and > angle brackets.
See the code example below. The custom denominator (in the second table definition) tells Proc Tabulate to calculate the PCTN across all the products within each region. So, you would see in this instance, that the PCTN for all the products for each region will add up to 100%.
cynthia
[pre]
ods html file='custom_denom.html' style=sasweb;
proc tabulate data=sashelp.shoes;
where region in ('Asia', 'Canada', 'Pacific');
title 'Compare These Tables';
class region product;
table region*(product all) all,
n pctn
/box='1) Regular N and PctN';
table region*(product all) all,
n pctn<product all>
/box='2) Custom Denominator';
run;
ods html close;
[/pre]