Used tzt13x with routes/points etc merging old points/ routes from a different tzt312

[Akisland]

I bought a used boat that has a tzt13xl and connected tzt9f. I used to have a tzt3 12 on my old boat and would like to merge my data with these new to me machines. I have data downloaded from my old boat to a usb drive or can log in via time zero account. What would best way to merge and still maintain current data on tzt13xl?

Thanks for any info