How to declare macro variable within datastep and using it within

data chk;
do i = 1 to 10;
array m(10);
do j = 1 to 10;
m(j) = round(ranuni(0)*100);
val = round(ranuni(0)*5 + 1);
end;
output;
end;
run;

data chk1;
set chk(keep = val);
p = _n_;
%let arr_ele = val;
set chk(keep = m%eval(&arr_ele)) point = p;
req_val = m%eval(&arr_ele);
drop m%eval(&arr_ele);
run;

Obviously this doesn't work. I need to read the val for each element and corrsponding array element i have to pick. Similarly i have to do it for each record. I dont want to keep the entire array and then read by using m(val) as the array size is huge. Can you please suggest a way to declare a macro variable and then use it within data step.

Thanks
Cherish