Need help replacing www with subdomain handle

[webmaster888]

I have got a not-for-profit website that is rather large. Please advise me on how to replace multiple (hundreds or even thousands) of www with a subdomain. handle after moving all the HTML pages from the website's root to a subdomain (as in subdomain.domain.com)? Is there an easy and quick way to do it? My host's (LiquidWeb) support did that for me recently such as a couple years ago, but they seem to not know how to do that anymore. I hope someone on here will help me do that even if for a small fee.

Change from: https://www.domain.com/anyfilename.htm
Change to: https://subdomain.domain.com/anyfilename.htm

Thus replace www with a specific word in the subdomain location for thousands of pages all at once.

 

[AlbaHost]

Is that whm Cpanel?

 

[webmaster888]

webmaster888

I have got Plesk. Transferred from cPanel a couple years ago

 

[AlbaHost]

AlbaHost

Why don't you use by forcing url redirection from domain to subdomain using htaccess?

 

[AlbaHost]

AlbaHost

Otherwise you can tey this method, not sure if it still works, backup your data before you proceed with below:

• Step:: Login to Plesk and open File Manager
• Step::2 Go inside public_html and create a php file with the name- findandreplace.php
• Step::3 Now copy the entire code provided in the link below: https ://pastebin. com/UaGaCuS6
• Step::4 Paste the copied code in findandreplace.php file and save the file.
• Step::5 Now run this file from the new tab.
• In order to run this file you have to write the exact URL like https ://domain. com/findandreplace.php Once you hit this file, a page will appear where you can search for a keyword and replace it in whole Plesk.
• In this way you can find and replace a keyword recursively in Plesk.

Hope it helps.