Right Click on thought / Copy all downline
The idea is to be able to copy and paste a chosen branch of the brain onto another thought...
Process would be
Right click on thought
Selct sub menu that reads
"Copy all down line"
Two sub sub menu options then appear
Choose either 1) or 2)
1) Discard all non-descended Parents and Jumps
2) Duplicate all non-descended Parents and Jumps (when pasting new branch)
...
Select new host thought from anywhere
Right Click on it
Paste
[Much re-invention of the wheel is saved]
and or you can manually edit the result

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Ben Huxham commented
In my comment earlier, I was wrong. The option to select children/jump/parents is in TheBrain9. It is still under 'Edit', called "select related thoughts"; so not sure how I missed it. Also, if you hold down 'Command' while selecting a node, those thoughts are selected automatically, for a quick tip.
For Windows or *nix machines one would probably have to use 'ctrl' but one should play to find out which particular modifier key selects it.
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Ben Huxham commented
I'd modify this to "Right click on node" contextual menu gives you the option "Select children/jump/parent". In TheBrain9 'crawl thoughts to select' is missing?! I used that all the time, but thought it could be faster.