I have confirmed Ctrl+Shift+A works. I selects all children of a node that is already selected. This is really great for quickly capturing a leg of the map and copy / pasting into an e-mail or text document. Thank you sifran. After having the tip from sifran, I went searching to discover where this shortcut was documented and so far, I haven't found any thing that documents it. I did find the quick guide at https://www.freeplane.org/doc/FP_Key_Mappings_Quick_Guide.pdf and I found a reference from...
Freemind has a shortcut alt-click which allows a node and all children to be selected. I want that feature in Freeplane. What has this been changed to? What is the keystroke now? How do I set this back up?