Select the TM from which to export via Tools > Resource Console... > Translation memories or Project home > Translation memories.
Click Export to TMX to export all the data in the chosen TM.
If a selective export (just some of the data in the TM) is desired, click Edit, enter the filter criteria in the dialog that appears and click OK. It is also possible to filter in the editor view. Only the data shown will be included in the TMX file created.
|The memoQ TM editor with filtered records shown. Click to enlarge.|
Here is a "video tour" of the process:
Ten brownie points to anyone who can figure out where I "cheated" with the translation information shown in the video.