Use get -delete.
See How do I create script that synchronizes files and deletes synchronized files from source afterward?

Hello,

I have a directory on a FTP with multiple subdirectories. I want to synchronize all files to a local directory (with same structure). After synchronization, source files should be deleted from FTP server.

I test with command synchronize but file in source directory is not deleted.
Is it possible to do this? And how?

Thank you
Eric