Collections on the system can be used to keep track of collections of products or parcel from a different location.
Client of a 3PL asks you to collect a number of boxes from the supplier. You can log that on the system so it doesn't get missed for charging
Once the collection is complete, you can mark it as Booked via Bulk Actions. The collection will be invoiced overnight, or you can invoice it manaullly via Bulk Actions.
If the client just wants to collect an order from the warehouse see -