%macro do_all;

%do i=1 %to &nobs;
    Data _null_;
        Set have(firstobs=&i obs=&i);
        call symputx('nm',nm);
        Call symputx('id',id);
        Call symputx('senddays',senddays);
    run;
    %dostuff(id=&id,nm=&nm,sendday=&senddays)
%end;

%mend;
%do_all