Here's a quick summary of the multi-serve (or multi-slot) functionality.
There is an extra charge for this function. Spoonfed's transaction charging means that your monthly charge for Spoonfed may decrease if you use multi-serve so we need to charge to balance this out. When you enable the freature, you will be asked to agree the charge.
To enable the feature, go to Setup > Features > Order Slots, and tick the box. If you would like your Customers to be able to add their own multi-slot orders through online ordering, go to Setup > Online Ordering > Options, and tick the box for 'Order Slots'.