Question about Fritz 17 standard opening repertoire

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Zigmund-80
Hi, I’m having trouble with the opening repertoire in Fritz 17. The manual says to load an opening from the program’s standard openings, and to save it into « my moves », which I did. The problem is when I play a game against AI, Fritz adds any move in that game to « my moves », messing up the repertoire. How to prevent that from happening ? I’d like to just store my openings in « my moves » (in order to drill them and only them) and not the rest. Is that possible ?
Thanks