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Thanks, this does indeed help:

I don't see how it can do that. I have "landscape-a6-1.pdf", "landscape-a6-2.pdf", "portrait-a6-1.pdf". With these I create a merged-pages.pdf:
\includepdf[nup=1x1, landscape, pages=1]{landscape-a6-1.pdf}
\includepdf[nup=1x1, landscape, pages=1]{landscape-a6-2.pdf}
\includepdf[nup=1x1 landscape ...

Thanks for the feedback.

With pdfpages I can merge the two landscape A6 pages into a single portrait A4 page.
However, the third A6 page in portrait format gets rotated during that merge.

I think a way to get around this is to have the third A6 page also in landscape format and rotate the text in ...

My goal is to have four DIN A6 areas on a sheet of DIN A4 paper, in landscape direction.

Initial attempts with a table did not work. The description of "picture" sounds like the box can be placed anywhere with the xoffset and yoffset parameter. But this does apparently not work. As a result only ...