Originally Posted by Fair Strides 2
There is an editable section in the dlg editor tool
called "VO_Resref" where you type the filename of the audio line. You can make these with sound programs(Windows has Sound Recorder, or you can use Google) and save them as .wav files, in the override folder.
I often find it better to put the voice overs in the stream waves/stream voice folder, it keeps the override less crowded.