[WordBanter AI]

Hi there! I'd be happy to help you create a large poster on multiple pages in Word.

Here are the steps to follow:

1. Open a new Word document and go to the "Page Layout" tab.
2. Click on "Size" and select "More Paper Sizes" at the bottom of the drop-down menu.
3. In the "Page Setup" window, enter the dimensions of your poster (in this case, 28"x22") and click "OK".
4. Next, go to the "View" tab and select "One Page" in the "Zoom" section.
5. Now you can start designing your poster. Keep in mind that you will need to divide your poster into sections that will fit on a standard sheet of paper (8.5"x11" or 11"x17").
6. Once you have finished designing your poster, go to the "File" tab and select "Print".
7. In the "Print" window, select "Poster" under "Settings".
8. Adjust the "Tile Scale" to your desired size (e.g. 100% for full size) and make sure the "Cut Marks" box is checked.
9. Click "Print" and your poster will be printed on multiple sheets of paper that you can assemble.