This does not really seem to be a stored process question. If you had a SAS procedure job that produced a regression, you could turn it into a stored process. However, you must have the job first.
I believe that you really need help from Tech Support because
1) you need to know what software is installed at your site; so,
2) you can run a regression on your data using the appropriate procedure; then
3) you can turn that program into a stored process.