Several vendors offer dedicated bridge and trade copier tools:
Many high-quality forex brokers only offer the MetaTrader suite. If you are a die-hard NinjaTrader user who refuses to trade on a subpar interface, a bridge allows you to chart on NinjaTrader while routing orders to any MT4 broker in the world. You are no longer restricted to the limited list of NinjaTrader-supporting brokers. ninjatrader to mt4 bridge
Traders typically use a bridge to combine the unique strengths of both platforms: Several vendors offer dedicated bridge and trade copier
If you are looking to set this up today, here are the most reliable options on the market: ninjatrader to mt4 bridge
Replicate trades from a single NinjaTrader account across multiple MT4 terminals simultaneously.