v15 of Data Prep introduced "Report Design" which is change from v14.3 and before which contained "Report Discovery". Report Design should have most (if not all) of the same features that Monarch Classic's report design contained (Detail, Append, Footer, Page Header, Start/Stop Regions, Exclusion templates). Any other modeling would be handled by DPS once you load the table that report design created (Calculated fields, lookup tables, joins, etc.). Once you have loaded the report in report design, you should not need to export that into Monarch Classic.
Monarch Server Automator allows for automation of DPS workspaces via visual processes.