FBA does not typically do product kitting.
Utilizing an advanced WMS system like Shipedge would let you manage your own kitting before you start the FBA inbound process in our system. This will also let you trickle kitted inventory into FBA based on demand planning and reduce your overall FBA storage and retrieval fees.
The other option is to work with a 3rd party logistics company that already uses Shipedge and has access to the kitting workflows in our software (as well as an FBA inbound process where you don’t need to share your Amazon Seller Central login).