Custom App role to have some fields as editable and non-editable on assignment page

Organization Name (Required - If you are an Oracle Partner, please provide the organization you are logging the idea on behalf of):

Metropolitan Atlanta Rapid Transit Authority

Description (Required):

To have Custom App role for making changes to certain fields on Assignment page and keeping the rest of the fields as non-editable

Use Case and Business Need (Required):

Different users to have access to few fields on assignment page and others non-editable.

Enhancement Request / Service Request:

SR 3-32287803811