iPhone, iTunes and icloud

I have a massive iTunes collection on my pc. I do not want it to sync with my iPhone as its storage is at capacity. My goal is to only have “playlists” on my iPhone. I need to know how to set up the pc to only manually move the playlists, not have the pc iTunes sync (thru iCloud). At this point I need to delete music files on my phone and set up manually moving my music files back to my iPhone.