How do I link 2 tracks together in a playlist?
I assume by "link" you mean "combine" as to make 2 or more tracks into one long track...?
1. Open the desired tracks to be linked (as one track) in a media editing program, such MC's own "Media Editor" audio editor.
2. Copy the successive track onto the end of the preceding track (or to prevent accidental over-writing, copy & paste the first track into a "New File" palette - make sure the bitrate sampling matches), and then copy and paste each following track at the end... rinse & repeat til all desired tracks are copied/pasted in a single file, and save as a new file to desired location.
3. Import the new file to the desired playlist(s).
Instructions on how to use Media Editor in more detail should be available in the "Help" section of your product.
If you wish to link/combine video tracks, you'll need a video editing program (following the same principle steps) outside of MC, as I do not know of any video editing tools within MC (unless they've added any since version 10? LOL)
If you need additional editing programs, NCH Software has an array of decent programs for multiple applications (file editing, CD/DVD ripping & burning, extracting audio from video, etc).