Assign filenames through the loop in SAS - loops

Question

I have a list of files that I need to import into SAS. I need to assign filename so that I don't type multiples times the same lines:
filename inf_1_1 'C:\Users\Main_1\final_complete_1.1.csv';
filename inf_1_2 'C:\Users\Main_1\final_complete_1.2.csv';
I tried to write %macro but it does not recognize the file name:
%macro FILENAME (I_FROM=1, I_TO=&I_FROM, J_FROM=1, J_TO=&J_FROM);
%local I J;
%do I = &I_FROM %to &I_TO;
%do J = &J_FROM %to &J_TO;
filename inf_&I._&J. 'C:\Users\Main_&I.\final_complete_&I.&J.csv';
%end;
%end;
%mend;
%FILENAME(J_TO=2); */
I am sure I am doing smth wrong and need to take the filename out of the string variable. But I don't know how to do it.
Any help will be highly appreciated.

Answer 1

See the modifications below - basically reduce the filename string to import the data.
List of issues:
Macro variables resolve only in double quotes, not single quotes
Macro call - don't include the & in the macro definition
FileRefs are limited to 8 characters
FileRefs are not necessarily needed
%macro FILENAME (I_FROM=1, I_TO=I_FROM, J_FROM=1, J_TO=J_FROM);
%local I J;
%do I = &I_FROM %to &I_TO;
%do J = &J_FROM %to &J_TO;
filename i_&I._&J. "C:\Users\Main_&I.\final_complete_&I.&J..csv";
proc import out=data_&i._&j. datafile=i_&i._&j. dbms=csv; run;
%end;
%end;
%mend;
%FILENAME(I_FROM=1, I_TO=10, J_FROM=1, J_TO=2);
As mentioned you don't really need the filename reference.
%macro FILENAME (I_FROM=1, I_TO=I_FROM, J_FROM=1, J_TO=J_FROM);
%local I J;
%do I = &I_FROM %to &I_TO;
%do J = &J_FROM %to &J_TO;
proc import out=data_&i._&j. datafile="C:\Users\Main_&I.\final_complete_&I.&J..csv" dbms=csv; run;
%end;
%end;
%mend;
%FILENAME(I_FROM=1, I_TO=10, J_FROM=1, J_TO=2);
Last but not least, you don't need a macro here:
data _null_;
do i=1 to 2;
do j=1 to 2;
*create filename;
file_name = catt('C:\users_Main\Main_', i, '\final_complete_', i, '_', j, '.csv');
*create output data set name;
outdata = catt('data_', i, '_', j);
*create command to import;
str = catt('proc import out=', outdata, ' datafile=', filename, ' dbms=csv; run;');
call execute(str);
end;
end;
run;

Answer 2

Thank you very much for the hints. I've written the following macro:
%macro Filename_loop (I_FROM=1, I_TO=&I_FROM, J_FROM=1, J_TO=&J_FROM);
%local I J;
%do I = &I_FROM %to &I_TO;
%do J = &J_FROM %to &J_TO;
filename inf_&I._&J. "C:\Users\Main_&I.\final_complete_&I..&J..csv";
%end;
%end;
%mend;
%Filename_loop(J_TO=2);