Use the Paste Text Into Book tool when you need to safely paste text into your document.
You can use this paste tool instead of the normal paste method to safely paste text into your document without overwriting the book's formatting (see: A Caution on Copying and Pasting). The Paste Text Into Book tool will strip any of the formatting from the original document it was copied from then apply the book style of the surrounding paragraph that you are pasting into. It will only paste the text that you have copied and will not paste any images, tables, charts, etc.
First copy the text that you want to paste into your book. Then place your cursor at the location you want to paste it into. Next click on the Paste Text Into Book tool. The following form will appear.
If you do not wish to see this form the next time you use this tool check the box next to "Check here if you do not want to see this message the next time you use this tool" before you click on the Paste button. If that is checked the next time you use this tool it will paste the text without showing you this form first.