Data Worksheets, also called "Raw" worksheets, are the physical destinations where external data can be synced and stored. Raw worksheets can contain data columns and derived columns. Data columns are where external data can be stored. Derived columns are not accessible via the API.
When syncing data to a Raw worksheet, the worksheet and designated columns need to exist. The API cannot create worksheets or columns. Admins will need to create data workbooks, worksheets and columns for the API to populate.