You can import topics and XML topic files to the current topic from the current project, from other Help+Manual projects and from libraries of Help+Manual XML files. You can either overwrite the entire current topic with the external file using Load Topic from File or you can insert the external file in the current topic with the Snippets tool.
You can also copy and paste topics and chapters from other projects in the same way as within your current project.
Use Snippets to build up a collection of pre-formatted text blocks and topics that you and your team use frequently! Just copy the XML topic files you want to use to a folder for storage.