As VideoTracks suggested, you can transfer melody sequences between the melody and soloist channels to create your multiple melodies. Another option is to create the melodies in FL and then import the midi file into Band-in-a-Box.

Place each melody on a MIDI channel.

Assign a midi patch number (how midi identifies instruments) to each melody channel.

Save the melodies file as a MIDI file.

Open Band-in-a-Box, or BiaB, for short.

Navigate to Melody > Edit Melody Track > Import Melody From MIDI to import the midi file to the Melody track.

Navigate to Melody > Sequencer Window For Multi-Channel Melody. +++ HERE +++ is a video that explains the multi-channel sequencer.

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Jim Fogle - 2025 BiaB (Build 1128) RB (Build 5) - Ultra+ PAK
DAWs: Cakewalk Sonar - Standalone: Zoom MRS-8
Laptop: i3 Win 10, 8GB ram 500GB HDD
Desktop: i7 Win 11, 12GB ram 256GB SSD, 4 TB HDD
Music at: https://fogle622.wix.com/fogle622-audio-home