Not sure that FD is.. As for 打ち出し、I'm reading what follows it:


打ちだしに訂正部分に下線を付す)...を添付してください。

I think this use of 打つ is reminiscent of the typewriter/punch card era, when 打ち出す meant to type, print, output or write. I cannot tell whether a hard copy or a digital copy is required as an attachment, but to me it seems asking to generate (print out) a copy the alternative FD (?) and underline corrections.