PAGE SETUP DIALOG

Choose your printer from the "Format For" drop down menu

Under "Paper Size" choose "Manage Custom Sizes". The below dialog will appear

(make sure to choose the right paper orientation for your print job)

Set the custom paper size.

* Important Tip - the smaller paper dimension is ALWAYS the width. The larger dimension is always the height.

Name and save the new paper size for later use.

* OSX Note

OSX may not handle custom paper sizes correctly. It is system and printer specific and may not happen to you. If it does, your margins will probably be off. Come back to this dialog box and adjust the Printer Margins. This may take some experimentation but is necessary.