SAS Command Line - Partial Program Execution

There are various options available to you:

1. Split out the 5 lines of interest into a separate file, then replace them with a %include statement in the original 100-line program
2. As above, but using an autocall macro or stored compiled macro
3. Write a data step that takes the 100-line .sas file as input, outputs only the 5 lines you want, and %include it - useful if you don't have write access to the file you want to run the 5 lines from, and you don't want to maintain a separate copy.
4. If you have already executed the whole 100-line program in the same session, option spool is set, and you know which line numbers the 5 desired lines occupied in the log, you can replay those lines via a %include statement.

For option 3, a sample data step might look like this:

%let SHORTFILE = %sysfunc(pathname(work))/shortfile.sas;

data _null_;
  infile "/path/to/100/line/file.sas" obs = 10 firstobs=5 lrecl = 32767;
  file "&SHORTFILE" lrecl= 32767;
  input;
  put _infile_;
run;

%include "&SHORTFILE";

If you're feeling brave and you really don't want to create an extra temp file, you can use call execute to do this instead:

data _null_;
  infile "/path/to/100/line/file.sas" obs = 10 firstobs=5 lrecl = 32767;
  input;
  call execute(_infile_);
run;