Field re-use in Custom Content Types

Hello - I am new to Opigno and am doing a PoC for eLearning. I want to have custom Activity Types (eg: Experiment, Research etc.) and I have created new Content Types for this purpose. I also need to add new fields (eg: Learning Objectives) for these Activity types. How can I re-use the new fields I have created for a Content type for another (new) type? When I create a new content type, I need to create all the fields again. Also, I don't see any option to 'clone and modify' Content types either. Is there a different/better way to what I am trying to achieve? Thanks!