Orders will always be split up into individual Order Forms with the appropriate Ship Date. For example, if your presentation contains 1 product with No Ship Date, 1 product with Ship Date in March, and 1 product with Ship Date in April, then 3 separate forms will be created when the buyer clicks Order on all 3 products.
Since the Order interface can only display 1 page at a time, the other orders will be accessible under the drop-down menu in the upper left corner.
At this time we do not have a way to combine multiple Ship Dates on a single form. Please contact Support if you have any further questions.