解决方法可以根据具体的编程语言和代码环境有所不同。以下是一些常见编程语言的示例：

1. Python

# 使用列表推导式筛选出包含特定值的子设置行
lines = ['setting1 = value1', 'setting2 = value2', 'setting3 = value3']
specific_value = 'value2'
result = [line for line in lines if specific_value in line]
print(result)  # 输出: ['setting2 = value2']

2. JavaScript

// 使用filter()方法筛选出包含特定值的子设置行
const lines = ['setting1 = value1', 'setting2 = value2', 'setting3 = value3'];
const specificValue = 'value2';
const result = lines.filter(line => line.includes(specificValue));
console.log(result);  // 输出: ['setting2 = value2']

3. Java

import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] args) {
        // 使用循环筛选出包含特定值的子设置行
        String[] lines = {"setting1 = value1", "setting2 = value2", "setting3 = value3"};
        String specificValue = "value2";
        List result = new ArrayList<>();
        for (String line : lines) {
            if (line.contains(specificValue)) {
                result.add(line);
            }
        }
        System.out.println(result);  // 输出: [setting2 = value2]
    }
}

请根据自己的实际情况选择适合自己的解决方法，并根据需要进行修改和调整。