Creation of approval rules using leasedetailid

We understand that lease approval workflow using 3 parameters

1. Using responsible username
2. Using lease number
3. Using leasedetailid

We could see that Leasedetaild can be seen only when we run the tables and generates uniquely for each lease number, but what values should be keyed in when setting up approval. Can anyone help us how to setup approval rules using leasedetailid.