There are several One Community posts that discuss using BRs to start, queue or execute DM sequences. Here are two:
Datamanagement sequence - OneStream Community
I would search OC to see all threads but the 2 above explain how this can work.
The other alternative, if each step is mutually exclusive, is to set them up in their own DM Sequences and schedule them separately as it sounds like they do not need to be grouped together.
Lastly, perhaps post your idea in Idea Stream to allow individual steps to continue even if prior step fails. Maybe a toggle of True or False upon fail to each step would allow you to control if a prior step has to be completed before the next step. Sounds like an Idea Stream idea to me!
