Importing old Invoices into Zoho Books - Hitting the limit

Importing old Invoices into Zoho Books - Hitting the limit

I'm currently working on importing historic invoices and payments made records from one Zoho Books premium instance into another however i'm hitting the 25,000 per year limit issue, these invoices go all the way back to 2019, and i understand that generating new invoices can have this restriction however we really need to be able to import these old invoices, is this something Zoho can help us with? Premium plan is perfectly fine, we just need to ensure the historic data is added in as well.