I got a paired-end-demux.qza from paired reads using the following command:
qiime tools import
However, I found the reverse reads had a very low-quality scores. So I plan to use the forward reads for further analysis. Is there any method changing the paired-end-demux.qza into single-end-demux.qza containing only forward reads directly, rather than importing the forward reads again using SingleSequencesWithQuality?