You can change the paper size on which you print your document and the paper source. For example, you may want to print on legal-sized paper that your printer stores in a separate paper tray.
Click File.
Click Page Setup.
The Page Setup dialog box appears.
Click the Paper tab.
Click here and select the paper size you want to use.
The height and width of the paper size you selected appear here.
A preview of your selection appears here.
You can use these options to change the paper source.
Click a location here for the source of paper for the first page you print.
Click a location here for the source of paper for the rest of the document.
Click OK.
Word saves your changes.
Can I print part of my document on one paper size and another part on a different paper size?
Yes. But you must first insert section breaks in your document for each portion you want to print on different paper sizes per the instructions in Chapter 7. Next, follow these steps.
Place in the section you want to print on a different paper size.
Follow steps 1 to 6 in this section.
In the Page Setup dialog box, click the Apply to and click This section.
Click OK.
Repeat the process for other sections of the document.