Can you stack .opd files? If so, how?

I have a handful of .opd files from a Wyko 3300NT that I need to stack. I originally tried importing .asc files, but ProfilmOnline would not open any of those, so I am trying the .opd files instead. They open one at a time just fine, but can these get stacked? This would be a big help. Otherwise, what are some workarounds? Thank you!