To raise a partial freight invoice and then raise the second invoice for the balance invoice qty

I have created a support ticket for this and the given options were,

https://vesonjira.atlassian.net/servicedesk/customer/portal/3/VS-213400

1. Split the cargo - Not workable as it will affect laytime calcs.
2. Create the split on a % basis - User does not want to use the inv%
3. Make use of an incremental invoice -What the user expect is the freight billing to be spilt by invoice qty where each individual invoice will only show the invoice qty & not the full loaded qty as per incremental invoice.