Hi again, I comment on my own comment, before someone else spend time on it.
The solution by Vicky “Split Planes to SpectrumGroup” is the best thing to do.
My issue was there because I had reduced the dimension in the pseudo3D from 3 to 2 in nmrpipe with the command
setfdata ft/test%03d.dat -ndim 2
this was how I before could transfer nmrPipe relaxation data set from nmrPipe to Assign. This doesn’t work any longer. (I believe this is also the reason why my spectra treated like this, and used in Assign 3.0 are not readable/seen in Assign 3.2)
The “Split Planes to SpectrumGroup” is a good solution.
best regards