Is this what you are looking to do?
data have;
infile datalines missover;
input
var1 var2 var3 var4 var5
var6 var7 var8 var9;
datalines;
349 990 805 391 193 39 870 890 467
951 273 781 17 965 265 761 528 244
173 561 335 999 25 275 651 511 349
80 588 797 133 768 162 105 444 197
819 724 191 831 444 337 93 948 864
897 675 715 983 863 910 652 914 754
56 384 306 364 545 714 747 312 939
606 272 907 602 44 116 793 155 53
118 172 680 649 676 769 487 435 333
734 328 981 338 549 642 149 64 575
;
run;
data want(keep=var5);
set have;
if _n_ = 6 then output;
run;