You can delete a table that you added in a data source if you do not use them in a TDM operation.
Open a project.
Click
Discover
Tables
.
Select a table that you want to delete.
Click
Actions
Delete Table
.
A confirmation message appears if the table does not contain any assignments.
If the table is part of an entity, a group, a masking plan, or a generation plan, the
Impacted Objects
dialog box appears with the list of affected objects. If the table is part of a template and if the template is part of a plan, the affected objects list does not contain the template and the plan.