It would help us to give you better advice if you tell us a bit more about how you are using NORMA "as a sketching tool".
In the meantime, I hope that the following suggestions are of help.
If you just want to create ORM diagrams, then you might also consider the Visio Stencils in the Library: http://www.ormfoundation.org/files/folders/visio_stencils/default.aspx
In NORMA, if you right-click on the drawing surface of a model page, you will see a "copy image" option which copies the whole page.
If you just want part of a page, then you can use a tool like Snagit to make .jpg's or .png's of selected parts of the NORMA diagrams which you can then paste into another program such as Word.
About 9 months ago, I discussed this with Matt and here is a summary of what he said:
Option 1: If you have the group feature enabled, then you can the fact types that you want to copy into a group put all the fact types into a single group and then drag the group from one model to another. The object-types and (non-external) constraints will be moved along with the fact types. This may cause changes in the diagram layout.
Option 2: The XML way:
2.1 Choose one of the files as a "primary" file.
2.2 Open the file as XML
2.3 Copy the contents of the following sections from the secondary file to the primary file:
You can also copy the diagrams across.
However, with this option, you will have to "manually" reconcile the shared data types sections.
The aim is to end up with only one of each data type in the primary file.
So you will need to delete any duplicates-after replacing references to the data type id (which is a guid) with the duplicate data type id that you want to keep.