As before, enter the desired shortcut and click Assign.Choose Home Tab from the Categories list box and then scroll through the Commands list and select Strikethrough.Click the Keyboard Shortcuts: Customize button.Click the Office button and then click Word Options.If you'd rather have a shortcut (which has the advantage of being available no matter what tab happens to be selected), the process is similar: Word 2007 has a Strikethrough button in the Font group on the Home tab - but no keyboard shortcut. How to strikethrough in Excel for Mac A quick way to strikethrough text in Excel for Mac is by using this keyboard shortcut: + Up Arrow + X. Now, you can select text and press the shortcut to apply (or remove) the Strikethrough format. The strikethrough shortcut (Ctrl + 5) works perfectly in Excel Online too and is often the fastest way to toggle the strikethrough formatting on and off. Click Assign and then click Close, then click Close again.You can overwrite the existing shortcut or delete what you entered and pick something else. If you enter a combination that's in use by another command, Word will display Currently Assigned To and the command. Click in the Press New Shortcut Key text box and enter whatever shortcut you want - we'll go with Ctrl + 7 for demonstration purposes here ( Figure C).Clicking in that list and pressing S will save some scrolling time. When Word opens the Customize Keyboard dialog box, select Format from the Categories list box and then scroll down the Commands list box and select Strikethrough ( Figure B).