Is there a way to update a provider in RMA? For instance, I have a list of Employees and the business Analyst would like to add a new employee to that list within RMA.
You can create a class template which contains all the employees. Add a properties template to the created class template. Create an instance and start adding ur employee information as properties into it. Use the class propertie sprovider to display the list of employees when & where required. This class will only be used during the design time and not runtime.
You can implement the similar requirement using many of the OOTB templates like ruleset - variables, Decision Tables (so that you can import and export data to and from excel) etc...
For RMAs that need to reference dynamic data, the usual solution is to implement a custom provider (using the custom provider API) that retrieves those items from some external source like a database, a web service, a flat file etc. That way your RMA will "allways be updated", at least to the same degree as the source system.
Retrieving data ...