its part of the FBA shipment process. If its not a lot they may force you to make several smaller shipments.
In inventory, click the items you want to send to FBA then select "convert to FBA", then from the FBA inventory screen click the ones you want to send in and clcik "send replenish inventory" it will now walk you through what to do for sending different items in the same box.
The Following User Says Thank You to LittleLilly For This Useful Post: