How to open a new ticket when the ticket is already closed in a specific state

[xtheb]

Hello,

Sometimes our operator change a ticket state to "closed (invoiced)" (it is a state that we have defined, a closed state).

But sometimes, customers reply to this ticket, but we don't want to reopen it, we want to open a new ticket.

We don't want to reopen it only if the state if "closed (invoiced)".

Is it possible ?

thank you