Like @SASKiwi says, Content Assessment should always one of first stops when planning for a Viya 4 migration.
Generally speaking, if you have Star Schema based cubes, they will be migrated as Viya Jobs.
Other Cubes will be migrated directly to CAS tables.
Things can get more complicated if you have used a lot of MDX expressions.
Any visualization on top of the cubes must be recreated manually in VA.
If you have Information Maps, they have similar migration paths.
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