You can set up multiple Banners to rotate within the Sliding Banner area but do not have to show them to Users until you want to.
For example, you could set up some Banners for a new appraisal process but turn those Banners off until you reach the launch date.
To turn a Banner on, click the Off switch next to that Banner's name.
To turn a Banner off, click the On switch next to that Banner's name.
Click on Save near the top of the page.