How do we make changes to offer letters from when they were configured during implementation?

Summary:

A third party configured our offer letters into Oracle at the time of integration. We now have some language to add to the offer letters and need to take some language out. I also need to add an offer letter to the system and make sure it's coded/pulls information as they do now but I am not sure how to do any of this as the third party set this all up for us. Any help is much appreciated!

Content (please ensure you mask any confidential information):

Our offer letter are configured in oracle where, the system creates an offer letter for us based on how the system was set up. We have to now make changes and want to remove some language and add new language but I'm not sure how to do this other then downloading the offer and uploadingit back into the system. I want Oracle to produce the offer letter as it does, with the changes we need.