The menu: File -> Combine with file...
Select necessary file from the file dialogue (the files only with the dat extension are displayed).
The merging of loaded data with the data from other file can be useful when it is need to obtain one data file from several files (for example, files, estimated by other users).
Notice: If in the loaded data already there is a subsection with the same title and same relative path, as well as in the imported file, the information in a subsection is substituted by new.