First, click the Apple icon in the upper-left corner, and then select “System Preferences.”

In “System Preferences,” click “Keyboard,” and then click the “Shortcuts” tab.

Click “App Shortcuts” in the sidebar.

Click the plus sign (+) to add a new shortcut.

A new window containing a drop-down menu and two text fields will appear. Click the dropdown labeled “Application” and select the Application for which you want to create a shortcut (we chose “Pages”).

Next, open the app and look for the exact name of the menu command you want to turn into a shortcut. We chose “Page Thumbnails” from the “View” menu, as it doesn’t already have a keyboard shortcut.

Return to the keyboard shortcut entry window and type in the exact name of the menu command you want to turn into a shortcut in the “Menu Title” box.

Then, click the “Keyboard Shortcut” box and type the shortcut you want to use to trigger it. We chose Shift+Command+K because it wasn’t already taken.

You can use almost any combination of Command, Option, and Control with any number, letter, or character key. You can also use Shift to make a unique combination.

Click “Add” and the popup will close. You’ll now see your shortcut listed in the “Keyboard” preferences. In the app, you should also see your new shortcut in the drop-down menu next to its associated command.

From now on, whenever you press that key combination, the menu item you chose will be triggered.