Use page styles to specify different paper sources for different pages in your document.
Choose View - Styles.
Click the Page Styles icon.
Right-click the page style in the list that you want to specify the paper source for, and then choose Modify.
In the Paper tray box, select the paper tray that you want to use.
Click OK.
Repeat steps 1-5 for each page style that you want to specify the paper for.
Apply the page style to the pages that you want.