If you have the Professional or Floating license version of Help+Manual you can also edit the real-time index directly with the Index Tool in Project > Tools. Note that this tool is only available in the Professional and Floating license versions.

This tool enables you to edit keywords in all the topics where they occur simultaneously. You can also add keywords to multiple topics and delete keywords from multiple topics at the same time, in one quick operation.

 

See also:

IDs, Context Numbers and Keywords (Reference)

Anchors - jump targets