Longterm TCO - separate individual sub-voyages (maintain one PnL)

On long term TCOs where multiple sub-voyages performed it would be beneficial to separate these individual 'sub-voyages' as the itinerary quickly can become cluttered and unmanageable, if say vessel on TCO for 1-2 years with numerous voyages with different sub-charaterers (ie the itineary is very long thus impossible to keep track of each 'sub-voy').
Suggestion is the ability to separate each 'sub-voy' under the main voyage ie have the ability to separate these voyages could be by having ability to create eg Voy 1-1, Voy 1-2, Voy 1-3 etc all belonging under Voy 1 and the PnL to be for the duration of the TCO (not each individual voyage). Alternatively have the ability to separate the voyages in the itinerary by manually enter lines for 'sub voy no' and 'Charterers' - this to create a visual separation of voyages.