Can we manually add missing ACA forms to reissue ACA file?

We have created our ACA files, distributed the 1095-C forms to employees, but not sent the file to the IRS yet. I have instructions on how to correct previously issued forms. We have a few forms to correct. We also have employees that should have received a form but did not because their ACA status was accidently set to "ineligible" and we did not catch this before the forms were created. How do we add them to the ACA file and generate forms for them? Can we do it at the same