Export Translations to TMX
Choose File > Export Translations to TMX to save the original texts and translations of the project as a TMX file. Use it to reuse the translations in another tool or another project.
To bring translations made in another tool back, import the TMX file with Project > Translation Memory > Import Matching Translations and translate the project with Project > Translate Using > Translation Memory. See Translation Memory Import.
To give a translator a task in a CAT tool, use XLIFF instead: it keeps the link to the project items. See Prepare Translation Task.
From the command line: -exporttmx:file. See Command line interface.
See also Lingobit Localizer Project.