You can merge your current project with another, by clicking the import icon on the upper icon bar of CRPA.
Warning: CRPA does not check whether the contents is the same as what the current project already contains! If you are not sure, you might consider first exporting only the parts you are interested in, from other projects.
Clicking the Import button, you can choose which CRPA project you wish to import and merge with your current project.
After opening the project for import, you can see that the number of Notes, Sheets and Attachments of your current project has increased. The statistics of the current project before and after the import can be read in the right panel to the top of the project tree. Compare these before and after importing a project.