------
## 最终结论
```python
def reduce_to_one(s: str) -> int:
    # Convert binary string to decimal
    number = int(s, 2)
    
    # Initialize step counter
    steps = 0
    
    # Loop until the number is 1
    while number > 1:
        if number % 2 == 0:  # Check if the number is even
            number //= 2     # If even, divide by 2
        else:                # Otherwise, it is odd
            number += 1      # If odd, add 1
        steps += 1           # Increment step counter
    
    return steps

# Example usage:
s = "1101"
print(reduce_to_one(s))  # Output: 6
```