Moving data between old mysql and new proxySQL with 3 mysql nodes

I have old data in single mysql database (~700GB), and want to move to ProxySQL with 3 mysql nodes - separate 2 big big tables on node 2 and 3, while rest of data on node 1. I readed how to do this by simply mysqldump, but I have lack of disk space, and dump didn't fit, so I wonder if there is another way to copy data.