About parallel sprint in trial version
One answer
No, iterations in one timeline can not be parallel and sprints 1,2,3,4,... are not meant to be parallel in Scrum anyway.
If you want several teams that work in parallel on the same sprint, you need to create several teams and assign them to the same timeline or different timelines, if the iteration rhythms are different.
especially https://jazz.net/wiki/bin/view/Deployment/RTCProcessFundamentals#Timeline_and_Iteration_Fundament