Setting fields in modeler without template

Is there any way of setting fields for each element without using template.
I want to set different fields for each element without using template.
Or with using the template in different way from open catalog .
When I add task will be some fields when I am selecting event there will be other fields.
The thing is that I want to use the modeler for export and import data from another application.
When I export the data I can not use template because it will override the data that is received the application
so I am wondering if there is another way for doing it?

In other words:
Is there way to configure or add symbols for modeler to show the fields I want?