Wanna underline a header?

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proc report data= ds split='^' nowd headline headskip spacing=1 missing;
by descending treat;

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column (rest1 rest2 ("_First Value_" (fval1 fval2)) ("_Second Value_" (sval1 sval2 sval3)) rest3 rest4);

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define rest1 / order-- width = 22 left-- "rest of the values (1)" spacing = 0;
define rest2 / order-- width = 22 left-- "rest of the values (2)";
define fval1 / display width = 22 center "first:-value (1)";
define fval2 / display width = 22 center "first:-value (2)";
define sval1 / display width = 22 center "second value (1)";
define sval2 / display width = 22 center "second value (2)";
define sval3 / display width = 22 center "second value (3)";
define rest3 / display width = 22 center "rest of the values (3)";
define rest4 / display width = 22 center "rest of the values (4)";

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break after rest1 / skip;
footnote1 "&under";
footnote2 "Required footnote for display.";

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run;

The above example: shows the use of "_" to underline the header(First Value & Second Value). These are the variables (fval1 fval2, sval1 sval2 sval3) which will get displayed under the header.
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