A nice home work 🙂
data have;
input Id $ xyz;
datalines;
A 1
A 2
A 3
A 4
B 1
B 2
B 3
B 4
;
data want;
do _n_=1 by 1 until(last.id);
set have;
by id;
if _n_=2 then _t=xyz;
else if _n_=4 then xyz=_t;
output;
end;
drop _:;
run;
Or since you desire traditional retain statement method, here you go:
data want;
set have;
by id;
retain _t;
if first.id then n=0;
n+1;
if n=2 then _t=xyz;
else if n=4 then xyz=_t;
drop n _t;
run;
Please mark the appropriate response (not this one) as the correct answer so that we know your question is resolved.
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