How
You create a new partial page and add some content e.g.
<div id="offer"><h6>Offer 1</h6>Your offer text here</div>
Then. you can add the the new yield to the relevant page by pulling in the yield:
<yield name="offer-1"></yield>
offset-1 in this instance would be the name of of the file you saved in step 1.
Benefits
The benefit of using the partial yields would be that switch out offers and content is as simple as changing the yield tag to the new one - without having to reload or rewrite the content.