Hi Kathakali!
You can change structure of ods/cube, only need assurance your data in psa or other ods in your PRO environment.
Then you can del or add your objects and apply changes in DEV.
Before transporting to QA, you need del your data of ods or cube or both, if applicable. Check your changes and reload your data.
If you need reload in PRO, as we disscused it is important you must have your data in other ods or psa, and only need execute a dtp. Now this process can be long time depend of your records.
I hope help you.
Regards.