Hi, I need export 5.1 WAV to 5.1:
AAC-to 192 kb/s,
WMA-to 192 kb/s,
MP4-to 192kb/s,
M4A, FLAC and OGG-to 320 kb/s.
Is it possible in Audacity?

Install FFmpeg if you have not already done so: http://manual.audacityteam.org/o/man/faq_installation_and_plug_ins.html#ffdown .

In the export dialogue, select the format you want to export as, then click the “Options…” button to see the quality choices.

You can read http://manual.audacityteam.org/o/man/file_export_dialog.html#compare to see the maximum number of channels each format supports. So WMA (v2) is “no” - two channels only.

MP4 is the same as M4A.