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How do I delete multiple messages at the same time on a Sony Xperia XZ. The only thing I can work out is to delete each message individually or the entire conversation. Neither option is preferred.. Thanks. ....
Hi @Gigsy1, let me see if i can be of any help here. 
It is possible to erase multiple messages at the same time in Xperia XZ. If you want to delete a single message, tap and hold on the message that you want to delete > Tap the option called "Delete message".
If you want to delete multiple messages, Find and tap the three dots in the top right corner > Tap Delete messages. When this is done you will be able to mark the messages you want to delete. Tap the garbage bin icon to delete the marked messages.
I hope this answered your question. Feel free to return if you have any further or other questions regarding your Xperia XZ. 