So you want to COMBINE projects. The way I would begin that would be to IMPORT all the topics from one project to the other. You will then have to add the Index keywords and Table Of Contents entries after the topics have been imported.
Thanks Rick. I should have mentioned too that the project I want to bring into the larger project has a rather intricate network of inter-topic links and I would like to preserve these linkages. Will this be posible or will I need to redo it all?
Also, can the topics be imported a batch, or must it be done one-at-a-time?
Sure, you can import the topics as a "batch" by selecting many topics at once.
As for the links, I'm thinking that as long as you maintain the relative locations between the linked topics, that all should be fine.
What I mean by the relative locations is to say that if you have a folder structure in the source project, you will need to ensure you have the identical folder structure in the destination. Then ensure the topics are copied to the exact folders.