How to migrate the historical reconciling items from a 3rd party system

Summary:

We are about to start our Oracle ARCS project. We are currently using a 3rd party solution to perform the GL and SL Recons. We been using our system from past 11 Years. We want to find out if there is a way to migrate at least a year worth of reconciliations from our existing system to Oracle ARCS for Audit purposes including the reconciling details and artifacts (attachments)

Content (please ensure you mask any confidential information):

We want to find out if there is an upload option available to load the historical recons which are closed and completed. We are looking for suggestions for any customer who have done this in the recent past.