It is only one set of files, use the audio montage.
If you have mutiples sets of files, consider doing it with the batch processor in 2 steps:
In your example:
Combine TAKE01_1.WAV and TAKE01_2.WAV, opened as dual mono files, into a new mono file A.
Combine TAKE01_3.WAV and TAKE01_4.WAV, opened as dual mono files, into a new mono file B.
Finally Open A/B as a dual mono file and save them as a stereo file.
The small difficulty is to take care about the naming pattern to recognize dual mono files. Read the doc for this.