I don't see it anywhere in the manual, and if it's not a feature at all these very ridiculous.
I understand the ATOM adds patterns one at a time, but the length of a single pattern should not be restricted to one bar, causing me to have to insert a variation 15 times for a simple 16 bar phrase with at least a minor amount of variation. Not everyone likes inorganic/metronomic beats.
If you use a single pattern and duplicate it, changing any of those 16 duplicates affect all the others, it's simply not ideal for anything musical and using the ATOM as part of a workflow. Variation is a quick command but then I have to redo the entire pattern or take too much out/add too much in x 15.