If you are looking for a single transformation that truncates many tables, there is none.
I suggest that you crate a User Written Transformation to do this, which is quite simple (I have done one for SPD Server once). Use macro lopping over the input tables to the transformation which you would like to truncate
The general table loader also supports the truncate behavior in 4.2 for most databases. You can also try that approach, and the Loop idea is a good suggestion to manage this for multiple tables.
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Need to connect to databases in SAS Viya? SAS’ David Ghan shows you two methods – via SAS/ACCESS LIBNAME and SAS Data Connector SASLIBS – in this video.