How can I export / import zPIV?

If you have zPIV on separate wallet.dat files and want to combine them, you can use the following steps:

Open the wallet with the wallet.dat you want to export zPiv from and go to tools -> debug console and enter the command
exportzerocoins true
Copy the resulting output of this command, everything from [ to ]
Please note: NEVER share the full output of this command with others as it contains the signatures needed to load and use your zPIV!
Close the wallet and replace the wallet.dat with the one you want to use (do not delete the wallet.dat, simply move or rename it)
Open the wallet with the preferred wallet.dat and go to tools -> debug console and enter the command
importzerocoins '
(Note the opening ') and then paste the output from the export command, followed by a final '

Again, the input following importzerocoins should be wrapped in apostrophes (') so it should look like:
importzerocoins '[ multiple lines of data ]'