How to replicate information from an approval process.
Use table and row replication:
Relationship 1 Table Relationship What you have - Object with Approval Process What you want - ProcessInstance
Relationship 2 Row Replication What you have - ProcessInstance (from above relationship) What you want - ProcessInstanceStep
We can replicate all the data in the Approval Process History. Though the data appears in a related list-style section, Salesforce stores this data as parent records (one for each approval) and child records (one for each stage of the approval).