When printing more than one page of content, you can associate each page of content with a different sprite (in this case, sheet1 and sheet2), and then use PrintJob.addPage() for each sprite. The following code illustrates this technique:

package
{
    import flash.display.MovieClip;
    import flash.printing.PrintJob;
    import flash.printing.PrintJobOrientation;
    import flash.display.Stage;
    import flash.display.Sprite;
    import flash.text.TextField;
    import flash.geom.Rectangle;

    public class PrintMultiplePages extends MovieClip
    {
        private var sheet1:Sprite;
        private var sheet2:Sprite;
 
        public function PrintMultiplePages():void
        {
            init();
            printPages();
        }

        private function init():void
        {
            sheet1 = new Sprite();
            createSheet(sheet1, "Once upon a time...", {x:10, y:50, width:80, height:130});
            sheet2 = new Sprite();
            createSheet(sheet2, "There was a great story to tell, and it ended quickly.\n\nThe end.", null);
        }

        private function createSheet(sheet:Sprite, str:String, imgValue:Object):void
        {
            sheet.graphics.beginFill(0xEEEEEE);
            sheet.graphics.lineStyle(1, 0x000000);
            sheet.graphics.drawRect(0, 0, 100, 200);
            sheet.graphics.endFill();

            var txt:TextField = new TextField();
            txt.height = 200;
            txt.width = 100;
            txt.wordWrap = true;
            txt.text = str;

            if (imgValue != null)
            {
                var img:Sprite = new Sprite();
                img.graphics.beginFill(0xFFFFFF);
                img.graphics.drawRect(imgValue.x, imgValue.y, imgValue.width, imgValue.height);
                img.graphics.endFill();
                sheet.addChild(img);
            }
            sheet.addChild(txt);
        }

        private function printPages():void
        {
            var pj:PrintJob = new PrintJob();
            var pagesToPrint:uint = 0;
            if (pj.start())
            {
                if (pj.orientation == PrintJobOrientation.LANDSCAPE)
                {
                    throw new Error("Page is not set to an orientation of portrait.");
                }

                sheet1.height = pj.pageHeight;
                sheet1.width = pj.pageWidth;
                sheet2.height = pj.pageHeight;
                sheet2.width = pj.pageWidth;

                try
                {
                    pj.addPage(sheet1);
                    pagesToPrint++;
                }
                catch (error:Error)
                {
                // Respond to error.
                }

                try
                {
                    pj.addPage(sheet2);
                    pagesToPrint++;
                }
                catch (error:Error)
                {
                    // Respond to error.
                }

                if (pagesToPrint > 0)
                {
                    pj.send();
                }
            }
        }
    }
}