Transfer songs to iTunes

If anyone can offer any help I would greatly appreciate it!

I have moved all my mp3 files from my old comp to the new comp. How do I import those mp3s to itunes on the new comp while keeping intact the start/end times of each song? Also how can I bring over playlists? These are both PCs

Simply importing the songs erases the start/end times I have chosen for each track.

Thank you!!