As a Product Manager I need the Gantt view to support sub-grouping and the ability to drop markers with labels that span over columns so that I can better organize roadmaps.
Hi @mfoster, first of all - welcome to our community, we are happy to see you here 
Thank you for the suggestions, have you tried adding it as a suggestion on our roadmap already?
If you haven’t, here’s your chance where you can let everyone know about it and potentially encourage others to vote for it! 
Also, if you have some perfect examples of it or extra details regarding the request feel free to let us know here or include them via the form linked above. We’ll be happy to discuss and see what we could potentially bring to infinity! 