Click the triangle icon at the top of the File Info dialog box, and choose a template name from the top section of the menu. The metadata from the template will replace the current metadata. To append the current metadata instead, hold down Ctrl (Windows) or Command (Mac OS) when you choose the template name.
In the Advanced section of the File Info dialog box, click Replace to replace the current information with information stored in an XMP file. Locate the XMP file containing the metadata you want to import, and click Open.
In the Advanced section of the File Info dialog box, click Append to add information stored in an XMP file to the current file information. (Append isn’t available if you’ve selected multiple files.) Each File Info field that doesn't contain information is updated with contents from the file. Keywords will always be appended with the information from the file.