You can copy topic notes between topics that already have notes.
Click a topic's notes icon to open the Topic Notes window.
Right-click the source topic's notes icon.
Click Cut Notes (to move) or Copy Notes (to copy).
Right-click the destination topic.
Point to Paste, then click Paste Notes. If the topic already has a note, the pasted note will be appended at the bottom of the existing note.
Right-click on the topic's notes icon, and then click Remove Notes.
Select the topics, and then do one of the following:
Right-click the notes icon on one of them, then click Remove Notes.
On the Home tab, in the Editing group, click the Clear arrow, and then click Notes.
You can temporarily hide the notes icons in Map View using the Show / Hide command.
Open the Notes window, then use the Cut, Copy, and Paste commands on the Home tab, in the Clipboard group to:
Move or copy all or part of a topic note
Paste text from other applications into the note.
Paste text from notes into topics. See Edit topic text and Create topics by pasting text for details.