I have learned over several years of writing on the web that the best way to add to stories with multiple parts, or continuations, is to use the same title with each hub and adding a dash and a sub-title. For instance:
Teddy Bear - Born In A Cave
Teddy Bear - Explores The Woods
Teddy Bear - Discovers Honey
When labeling titles with Part One, Part Two, etc, readers seem to lose their interest because that designates that one must follow hubs in a certain order. This may work for some stories that continue and should be read in order, but I try not to write stories like that. I prefer to write each hub/article in such a way that it can stand on its own.