This might help,
Copy and paste objects for Publisher 2003 Copy one object
Right-click the object you want to copy, and then click Copy.
Right-click where you want to copy the object, and then click Paste.
Copy multiple objects
Hold down SHIFT and click the objects you want to copy.
Right-click the objects, and then click Copy.
Right-click where you want to copy the objects, and then click Paste.
Copy and paste objects
PS. I have been thinking

do you mean you want to copy an Existing 4 Page Publication out of your Files, or are you asking how to set up a 4 Page Publication in Publisher, and then Print it out in Publisher??
If so click on "Blank Publications" in your Taskpane, select 4 Page Side Fold, or 4 Page Top Fold Card, 4 Page Selection (4 little Squares, 1.2.3.4.)will show on the Bottom of Page, click on each Page in turn to open, go Insert Picture or Text from File etc. when happy click on Print Preview to check correctness, then click Print.
It might be a little easier in 2007 which I have not installed yet.
Help Website for 2007 Publisher below
http://office.microsoft.com/en-us/publisher/FX100649111033.aspx?CTT=96&Origin=CL100632931033