Following approaches one can use to promote OTBI objects from one instance to another.
1) Manual : Old school method. Manually follow same instruction as development. This is beneficial if change is simple only in layout or in one data set and you are unsure about other changes in development instance.
2) Archieve/Unarchieve :
On catalog screen we can see Archive and Unarchive options.
Select the object and click archive for export OR
Click on More and select archive option.
*.Catalog file will be created.
Login to target instance and use unarchive option and select catalog file.
3) Upload/Download :
On catalog screen another option available is upload/download.
if download option is not available, open XMLPSERVER
<POD_URL>/xmlpserver
Example : https://san-test.fa.ap1.oraclecloud.com/xmlpserver
This will open BI Publisher Enterprise ( Old BI Publisher feature - Only BIP Data Model and Report are available).
*.xdoz (Report) & *.xdmz (Data Model) file will be downloaded.