About model calibration

Dear EFDC team and users, How to define things in model calibration,what files should we load? By learning other cases, I think we should load .dat files(such as WL.dat files),then how do we export such files?
3.png

You can look at this model to understand this better:https://www.eemodelingsystem.com/modeling-resources/demonstration-models/dm-06-lake-water-quality-example

Thank you