I don’t know if this is the right place but I think if we had that feature it would be much easier to organize some procedures (specially when they are huge)
You might want to check out Dynamo 2.13, as the ability to nest groups was added there.
If that wasn’t quite white you have in mind, the best way to request a feature is by creating an ‘issue’ on the Dynamo wishlist, here: Issues · DynamoDS/DynamoWishlist · GitHub.