I plan at a high level, mostly in the winter months, and just go by feel for the most part on a micro (weekly) level.
So going in to last winter the plan was Base with 20 hours weeks with mostly z2 and some hard group rides, then Build is less hours but more intense.
But by the time I start racing, my training structure generally goes out the window and I go by feel and just race a bunch, try to keep the CTL from going down too much, and rest when I'm tired.
Hard to stay structured the whole year!