Try to understand the basic concept first.
Open the "RelationshipTypes" for Part Changes, Document Changes or CAD changes. Take a look at the RelationshipView tab. What you see is a link to the codetree. The "changes" view is a special rendering made by files in the codetree. The RelationshipViews should link to the files that are mentioned in the threads I posted before.
Now go to the Aras installation folders (=the codetree) and check out these files. First try to understand the files. Try to find the names of certain ItemTypes and properties. If you want to modify them, try first on an independent test system and make a backup.
Tip 1: If you need something custom for your own ItemType, work with a copy of the relevant files. You are not forced to reuse the Aras files, you can also create your own and use these.
Tip 2: Always write down codetree changes! Document what files you have changed and why. Avoids much trouble!