Syncing only songs Spotify doesn't have available

[MightyMsMoka]

Hello,

I'm sorry if this has been asked before, but I couldn't seem to find it anywhere.

Ok, so here's my issue: I have a pretty large playlist (500+ songs) that acts as my go-to random music list. I own about half, if not more of those songs on my PC. The large majority of these songs are available through streaming on Spotify, so I would like them not synced. However, there are a few that are not available. I want those synced.

Now, my question is, is there any way to sync ONLY the songs that Spotify does not have available for streaming in a playlist? The only way I could think to do it would be to have Spotify stop watching my music folder and make another folder for it to watch with only the few songs I want that are not available for streaming. It would be nice if there were a better way though.

Thanks for any answers (I hope I was clear enough. Ask if anything is unclear...)