A family of Microsoft word processing software products for creating web, email, and print documents.
By default, pasting usually takes on the formatting set in the receiving documents. Other replies in this thread suggest how you can force your formatting on to an existing document. In the long run, though, you will get better results from Word by formatting a template or document to the styles that you intend for the final appearance. Then, pasting content in will automatically assume the look that you seek.