You mean trading strategies, right!? In that case not only that is allowed, but it is recommended. You can not use one and a single trading strategy in different market conditions. You must adjust your strategy according to the market situation. Let me give you an example, if the market is trending, then waiting for a breakout setup if your mainly trade breakouts would be pointless. You will lose plenty of opportunities. If the market ranges, and it knows to range even for a couple of days, then you better change to trading the highs and lows… and so on.
That's why a pro trader is a versatile trader who knows when and how to change the trading strategy according to the market conditions.