I consider that you want to delete all records from the Data table associated with the Data type. For that, You can write activity in the required class with Obj-Browse, Loop, and call Obj-Delete-By-Handle stepsand run it Standalone to delete all the instances of the particular Data Type.
Here is the sample Activity :
In Obj Browse step, follow this configuration to fetch all rows from the data table.
In Pages & Classes, Declare respective class.
Let me know if you face any issues while implementing the above. Good Luck!