You mean >(=pct10 v3) var2 or nothing else?

proc means get pct10 , then merge original data , select >=pct10 value.

data a;
input var1 var2 var3   id $;
cards;
1 12 5 A
1 32 7 B
1 34 9 C
1 35 11 D
1 50 13 E
1 60 15 F
1 34 17 C
1 35 19 D
1 50 20 E
1 60 21 F
2 13 5 A
2 33 7 B
2 33 9 C
2 34 11 D
2 55 13 E
2 66 13 F       
;
run;

proc rank data=a out=b percent;
var var3;
by var1;
run;

data target;
        set b;
        if var3=10;
run;