How to Create our own permission Group in SharePoint 2010?

Step 1: Open Site

Step 2: Go to Site Action and Click Site Permission link.

Step 3: Click Permission Level Link Button.

Step 4: Click  Add a Permission Level

Step 5: Give Your own custom Permission Name

Step 6: Select the permissions to your custom permission level.

Step 7: Click Create Button.

Step 8: Click Site actions link after Click Site Permission 

Step 9: Click Create Group Icon 

Step 10: Follow  below screens