I'll start from the back. You can drive by car, but be careful because there is snow on the road in some sections.
If you plan to do the route Prtovč - Jesenovec - pl. Klom - Kosmati vrh - Vratca - Gladki vrh - Krekova koča on skis, that's fine. For hiking it's not trodden, and skiers won't be thrilled if you walk on the track and poke holes in the piste.
The path Prtovč - Razor - Krekova koča is nicely trodden. Kosmati vrh can be an optional addition.
Wish you a pleasant day