I tried creating a Data Table in Pega 7.4.0. I went to Designer Studio -> Data model -> Data Tables -> Data Tables.
I don't see Create a New Data Table option here. It says, " Data Tables have been replaced by the new local data storage format. Please click 'Convert' on each data table to convert them into the new format. To create storage for a new data type, go to the Data Explorer. ".
I found these steps online:
Localdatastorage lets you store data records for a data type without having to manually create or maintain database tables. Localdatastorage is used with a data type's record editor. Access localdatastorage on the Sources tab for the data type in the Data Designer.
Use the LocalDataStorage wizard to create a localdata source: