Autofill linked/portal field, when data entered in other field
I need to autofill data into a linked file (data). The field "parameter" ,needs to be auto-entered when a data is entered into another field "text" or "numeric" through a portal . I currently have multiple files - one is called "data" another "events" another "locations" and on.. So for a particular event, the user can view the data collected via the event file. I use a portal filter to view the specific data for the specific event. This is currently working.
Unfortunately I can't seem to figure out when new data is entered - I am not able to have the "data type" auto enter. There are many different data types. I have attached an IA diagram that might help explain what I am trying to do.
Look forward to any helpful suggestions.