I did this with the Workforce 840 dialogue. Your printer may have similar selections.
- Create the jpg you want
- View the jpg in Paint Shop Pro
- Select "print" and select "fit to page"
- Click "properties"
- Click "page layout"
- Click "reduce/enlarge document"
- Click "by percentage" and put in "100"
- Select "multipage"
- Select "poster printing" and "2x2
- Click "ok"
- Click "print"