The Management Portal allows you to Export one or more globals to a file that you can then Import into that or another namespace.  However, the Management Portal can only be used to export entire globals.  For exporting selected nodes or subtrees within a global, a different utility is necessary.   This utility is the Export() classmethod in the %Library.Global class, which can export an entire global but also has the ability to export selected nodes or subtrees.

For example, consider this global named ^DATA:
^DATA(1)="ONE"
^DATA(1,2)="twelve"
^DATA(1,2,3)=123
^DATA(1,"two")="three"
^DATA(2)="TWO"
^D