As of right now, the platform is only able to support the booking of one Helper per task.
If you wish to hire more than one Helper, we advise you to simply repost your task and let someone make you an offer. Make sure, however, that you include as much information about your task requirements as possible so that Helpers will know that you are assigning a number of Helpers to work on it.
For more pointers about how to write a good task description, click here.