It's time to finish your work and save the final KB.
Select "Save KB -" from the "File" menu.
You can also save just a portion of the KB. Highlight a term by clicking on it. Select "Copy subgraph to new KB..." from the "File" menu. A dialogue form appears which will ask you for a name for the new KB and various other specifications.
In the example below, we are creating a KB that has the subtree below and including Weapon-of-Mass-Destruction.
For further help with Chimaera, use help within Chimaera or look at Chimaera's documentation.