A local copy of the file you have selected to import already exists in your current Libero IDE project folder.
Use the current dialog box to:
Rename the imported file - Type a new filename into the field to rename the file.
Overwrite the existing file - Replaces your existing file; Libero IDE does not save a backup of you existing file.
Use Libero's File - Ignores the file you chose to import and uses the copy in your local project folder instead.