8. Batch File Translation. If you want to know how to translate large groups of files simultaneously, look for batch translation in your software's features list. Batch file translation allows you to simultaneously run groups of files through machine translation to quickly translate large documents-- regardless of file type. 9. Launch PDFelement, click the "Combine" box on the start page under the Quick Tool tab. Combine PDF. In the new "Combine PDF" Window, drag and drop files or click the "Add Files" button to import the PDF files from your computer. (Tip: To combine attached files from emails, you can directly drag and drop the attachments to the "Combine" Window.)