You can create, edit, duplicate or delete the custom page size in Page Setup. With custom page sizes, you define page dimensions and margins.

1. In your application, click File > Page Setup.
2. Click Manage Custom Sizes in the Paper size menu, and do one of the following:

   • To create a new custom page size, click the plus sign, double-click Untitled and type a name for the custom page size, and type the page dimensions and margins.

   • To edit the page dimensions and margins, select a custom paper size from the list, edit the values and then replace the existing Custom Page name by clicking it.

   • To delete a custom page size, select a custom paper size from the list, and click the minus sign.

   • To duplicate a custom page size, select a custom paper size from the list, click Duplicate, double-click the duplicate name, and then type a new name.