I don’t see an existing import script for Cusdis (and haven’t heard of it). See discourse/script/import_scripts at main · discourse/discourse · GitHub for examples, and use one as a model to create one. I wrote several before really learning Ruby, so if you are a programmer and know a bit of SQL you can probably do it. If you’re not a programmer or would rather not write such a script, post in #marketplace or see https://www.literatecomputing.com/discourse-migration/.