How do I insert 5 blanks after the word Books has been used.

I have about 6000 rows in my spreadsheet and there was supposed to be a
total cost. In col A there are lots of blank rows except where words such as
"Books" or "Total Books" or sometimes "Text Books" appear.

Where the word "Book" appears, I would like to add 5 rows below that word.
Thank you.

--Elaine