How can I one-off print many files as pdf file in FrameMaker?

In FrameMaker,I open many files, these files need to print pdf files,How can i one-off print these opened files as pdf files?

thanks Mike's reply:Why not put them in a book?

of course,When I put them in a book ,They can print as one pdf file,but I want to print one opened file to one pdf file,are there anthoer methods to deal with the difficult problem. thank you!