Hi @arusoft ,
the best approach should be to move all these knowledge objects in one or more custom apps, package them and upload them to your Splunk Cloud instance.
The only issue that you could find is if you used some special thing as scripts, custom commands , etc... because they aren't accepted in SC.
In addition, you have to manually add to all dashboards, in the first row
version="1.1"
for this reason, maybe the process could be:
Ciao.
Giuseppe