The next step is to edit the configtx.yaml file, which represents an exhaustive list of all the internal resources defined by Fabric. It will be used later to create a channel and related artifacts. Here's the configuration we need for our network:

# Blockchain by example.
Profiles:
    FSCOrgsOrdererGenesis:
        Orderer:
            <<: *OrdererDefaults
            Organizations:
                - *OrdererOrg
        Consortiums:
            FoodSupplyChainConsortium:
                Organizations:
                    - *Org1
                    - *Org2
                    - *Org3
    FSCOrgsChannel:
        Consortium: FoodSupplyChainConsortium
        Application:
            <<: *ApplicationDefaults
            Organizations:
                - *Org1
                - *Org2
                - *Org3
################################################################################
#   Section: Organizations
#   - This section defines the different organizational identities which will
#   be referenced later in the configuration.
################################################################################
Organizations:
    - &OrdererOrg
        Name: OrdererOrg
        ID: OrdererMSP
        MSPDir: crypto-config/ordererOrganizations/fsc.com/msp
    - &Org1
        Name: Org1MSP
        ID: Org1MSP
        MSPDir: crypto-config/peerOrganizations/org1.fsc.com/msp
        AnchorPeers:
            - Host: peer0.org1.fsc.com
              Port: 7051
    - &Org2
        Name: Org2MSP
        ID: Org2MSP
        MSPDir: crypto-config/peerOrganizations/org2.fsc.com/msp
        AnchorPeers:
            - Host: peer0.org2.fsc.com
              Port: 7051
    - &Org3
        Name: Org3MSP
        ID: Org3MSP
        MSPDir: crypto-config/peerOrganizations/org3.fsc.com/msp
        AnchorPeers:
            - Host: peer0.org3.fsc.com
              Port: 7051
Orderer: &OrdererDefaults
    OrdererType: solo
    Addresses:
        - orderer.fsc.com:7050
    BatchTimeout: 2s
    BatchSize:
        MaxMessageCount: 10
        AbsoluteMaxBytes: 20 MB
        PreferredMaxBytes: 512 KB
    Kafka:
        Brokers:
            - 127.0.0.1:9092
    Organizations:
Application: &ApplicationDefaults
    Organizations:

We define, among other things, the path which contains the MSP configuration for every organization.

You can refer to the sample configtx.yaml shipped with Fabric (https://github.com/hyperledger/fabric-test/blob/master/feature/configs/configtx.yaml) for all possible configuration options.