Epson Stylus Photo 1290 User Manual page 73

If you only want to print a few of the panels without printing the
entire poster, click the panels that you do not wish to print, then
click OK to close the Poster Settings dialog box.
How to make a poster from your printouts
Here is an example of how to make a poster from 4 sheets of your
printout. Refer to the accompanying illustrations as well.
1. Vertically cut the margin of Sheet 1 along the line connecting
the alignment markers as shown in the illustration.
3-35
Printing with Windows