Hi Eddie,
Can you post a picture shwing the smaller bulbs.
Dendrobiums don't usually have bulbs as such, but I'm guessing they are short old 'canes'. Mine has a couple which are so short they look like bulbs. A photo would help us to tell.
If so they are probably just acting as water storage and will probably not grow, but help the plant balance it's water in drier times.
Dendrobium - Orchid Board
This is the dendrobium care sheet from Orchid Board, but dendrobiums are a large wide ranging group and different care is needed for different types of den. I'm afraid I'm not sure which category yours falls in to.