Indent is a style attribute. It can be defined in a style element or as a style over-ride. This example shows both ways, It just depends upon which classlev statement you use. With proc print, report or tabulate the style or over ride can be specified in many ways.
proc template;
define style mystyle;
parent=styles.default;
style myclasslev from data/
indent=10;
end;
run;
ods listing close;
ods pdf file="file.pdf" style=mystyle;
ods tagsets.excelxp file='temp.xls' style=mystyle;
title ;footnote;
proc tabulate data=sashelp.class; * missing;
class name age / order=data;
/*classlev name / s=myclasslev;*/
classlev name / s=data[indent=10];
table name=' ' all="Total",
age=' '*(N COLPctN='%') / box="Agegp" ;
run;
ods _all_ close;