Step 1:Log in to your Joomla site as the administrator.
Step 2: Go to the ‘Mange menu’ under the ‘Menu’ link and create a new admin menu.
Step 3: Customize the menu positions, disable or/and add new menu items for your new admin menu.
Step 4: Now you can replace the default admin menu with the new one.
Step 5: Go to the ‘Modules’ option under the ‘Extensions’ menu from the admin panel
Step 6: Once you are in Modules list, switch to Administrator module list from the drag town
Step 7: Edit the “Admin Menu” module and provide the necessary details in the field “Menu to Show”, choose new menu “Admin Menu” (or other name which you’ve used).