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To enable crop marks in Publisher 2010 you have to both set your paper size to larger than your page size and then set your publication to use crop marks.
Set the paper size
Click the File tab to open the Backstage View.
Click the Print tab.
Under Settings, select the paper size pull-down menu and select an appropriate paper size. For example, if your page size is 8.5” x 11” (letter size), then you might choose an 11” x 17” (tabloid size) for your paper.
Enable Crop Marks
Select Advanced Output Settings.
In the Advanced Output Settings dialog, select the Marks and Bleeds tab.
Under Printer’s marks, make sure that Crop marks is selected and click OK.
Once you’ve set your paper size and enabled crop marks, you can see them in the print preview pane for your publication.
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