My font is in 4 ttf different files: regular, bold, italic and italic bold. When submitting to Dafont, can I submit all 4 files at once? Do I have to pack the 4 files into a zip?

yeah, zipping is the way.
zip the 4 weights along with an optional read me file, and an optional illustration.

Thank you!

you're welcome

hi, are you dafont admin?