You can create, edit, and activate a decision table using a Metadata API.
Available in: Lightning Experience
Available in: Decision Table is available with Enterprise, Unlimited, and
Performance Editions with Loyalty Management or Rebate Management
DecisionTable
Represents the information about a decision table.
DecisionTableDatasetLink
Represents the information about a dataset link associated with a decision table. In a dataset link, select an object for whose records, the decision table must provide an outcome.This type extends the Metadata metadata type and inherits its fullName field.