Hello @azarshaikh9 

You're right when you found out that using reference fields dot walking, you can add them in your incident form via dot walk without creation of fields. This will help you to auto-populate such fields like Caller.Email and Caller.Manager when you select a caller while creating Incident 

When you look at the Incident List view, these fields are not present rather you have to end up creating them if want them in your report. So, when you create such custom fields like "Caller Manager" and you have to populate values in such custom fields based upon any other field "Caller" onChange then you end up creating Glide Ajax enabled Script include and calling it from your onChange Client Script.

Hope that helps!