Enter the code Selection.PasteSpecial DataType:=wdPasteText, as shown here, and then choose Close And Return To Microsoft Word from the File menu.

To create a button to run the macro, choose Tools | Customize and click the Commands tab. Then, choose Macros from the Categories list.

Select the new macro from the Commands list box (e.g., Normal.NewMacros.NoFormatPaste) and drag it to the toolbar where you want the button to appear. Next to the regular Paste button might be a good choice.

When you release the mouse button, the macro will appear on the toolbar where you dropped it.

To shorten the name, right-click on the macro to display a shortcut menu. You can then edit the name that appears in the Name text box, In this case, we deleted the extra text at the beginning. Click Close in the Customize dialog box.

The button is now ready to use. Anytime you need to paste text without its formatting, just click this button.