Magento – Remove parent categories from subcategory in URLs in 1.9.2.3

Magento version is 1.9.2.3.

I have tried following solution which doesn't work for me.

Step 1: Go to app/code/core/Mage/Catalog/Model/Url.php copy this file to app/code/local/Mage/Catalog/Model/Url.php because it is core Magento file so that we have to copy that file into the app/code/local.

Step 2: Now search for the getCategoryRequestPath($category, $parentPath) around line 698 in Magento ver. 1.9.1.0

Step 3: Search if (null === $parentPath) around line 717 and comment the line as below:

/* if (null === $parentPath) {
$parentPath = $this->getResource()->getCategoryParentPath($category);
}
elseif ($parentPath == '/'){*/
$parentPath = ''; //DO NOT Comment this line
//} 

Step 4: Now Go to the Magento admin and Clear Cache System->Cache Management and Reindex System->Index Management the data.

Step 5: Refresh your browser cache and navigate again now you will see only the Sub Category in Url not the Parent Category just like as: http://www.abcxyz.com/test-category-level-1-3.html
See more.

I have also tried this solution which doesn't work for me.

Suppose you want to remove parent category path from url such as
Url-> www.domain.com/cat1/cat2 to www.domain.com/cat2

USAGE :

1. Go to the Magento Admin Panel -> System -> Configuration -> Catalog -> Seo Options
2. Select yes or no from "Use Parent Category Path for Category URLs"
3. Refresh category url index.

Option YES => www.domain.com/cat1/cat2

Option NO => www.domain.com/cat2

Help me if you have another solution