To make a copy of an existing dataset structure, so that you can recreate it in another tenant, open up your dataset and the property panel, and click 'copy' followed by ctrl+c:
Once you've copied the property definitions to the clipboard, create a new dataset where you want to paste this structure, by clicking the '+' top right:
Open up the property panel and click 'paste':
Press ctrl+v to paste the data structure in from the clipboard:
Your data structure and property definitions will now be copied over into your new dataset.