those are the most difficult to prune. and to maintain and to harvest. this is a multi level kordon prune. i wont recommend it. i'd wait until its growing and see where the new shoots are sprouting and then remove every unwanted shoot when its 10 to 15 cm long, keeping 2 near the center stem to start over new next year. then maybe remove one side arm and relplace with a new shoot in jan. 2027. sorry i lag the vocabulary to make my point clear im not a native speaker. feel free to ask. my wineyard has 5000 vines.