Can a Copier choose to copy only certain instruments or specific trades from a Master Trader?

No. When you subscribe to a Master Trader’s strategy, you copy all the trades they make under that strategy. BitDelta Pro does not currently offer the option to filter by instrument or selectively copy individual trades while skipping others. You follow the complete strategy as a whole. If you want exposure to a specific instrument only, look for a Master Trader whose strategy is focused exclusively on that instrument.