Steps to apply custom master page to all SharePoint 2010 sub sites

In this blog you will learn how to apply master page to all SharePoint 2010 sub sites.

Steps

1. Go to Site Actions -->Site Settings.
   
2. Click on Manage Site Features.
   
   
   
3. Activate SharePoint Server Publishing.
   
   
   
4. Go to Site Actions --> Site Settings again and under Look and Feel click on Master Page.
   
   
   
5. In Site Master Page click on the drop down and select your custom master page.
   
   
   
6. Put a check in Reset all subsites to inherit this site master page setting and then Click "ok" at the bottom of the page.