I have 4 water balance models (WBMs), each representing its distinct mine operation. Each of these WBMs has its individual owner, who is the person authorized to update the model with new monitoring data and integrate new mine plans. Now, all mine are located in the same watershed. Therefore I’m the owner of a 5th model that nests these 4 WBMs and route water and loading downstream. What is the best way to manage such a system so that I can run all models together in tandem, and all updates made to individual WBM will be reflected automatically in the entire system? I had considered using Sub-models and import existing files in a main model but it appears that subsequent updates to the source WBMs are not reflected in the main model. Any suggestions?