# Instrument Filtering & Replacement

### Selective Copying

**Instrument Filtering**: Copy only specific instruments

* White-list approach: Only specified symbols copied
* **Example**: Copy ES and NQ only, ignore all other trades
* Multiple instrument support per copier

### Symbol Replacement

**Automatic symbol mapping** for contract size differences:

* **ES → MES**: Full-size to micro automatically
* **NQ → MNQ**: Nasdaq full-size to micro
* **Maintain strategy**: Same setups, appropriate sizing

{% hint style="warning" %}
Only mini/micro pairs allowed for replacement in order mode
{% endhint %}

### Use Cases

* **Account size matching**: Large account to small account copying
* **Prop firm requirements**: Specific contract restrictions
* **Risk management**: Limit exposure to certain instruments

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