Hi @Jen_S,
Yes. It sounds like you have demultiplexed sequences but I am not sure of the exact format (you will need to provide more details) but if you can get these into a format similar to qiime1 demultiplexed sequences, you can use the following command to import:
qiime tools import
–input-path seqs.fna
–output-path seqs.qza
–type SampleData[Sequences]
Not yet — we do not have much experience with this format and have only had a few users working with this format (which is to say that we are very interested in learning more to support this format 
).
There have been a few other posts about ion torrent data on the forum (e.g., here). If you do run into specific problems with importing, I would recommend first trawling the forum to see what other users have recommended in the past.
I hope that helps!