In SAP Marketing Onpremise is it possible to modify a CBO (Add Fields) after it has been packaged, transported and exported to the PRD environment?
Any SAP Marketing Onpremise documentation of how to create custom objects and attributes and transport from DEV, QAS to PRD?
Once the CBO is transported, you can add new fields, but you can not change the field types or delete fields.
The following KBA tells that the filed type can not be changed: 2931127 - Field ID was transported. The type cannot be changed - https://launchpad.support.sap.com/#/notes/2931127
Help Document for creating Custom Fields for OnPrem 2020: