Hello @sdnazdi
Indeed, switching to the child theme will make you “lose” your customisations, as WordPress considers every child theme a “different” one.
Though, we did recognise that this workflow is a bit counter productive so we’ve built in a feature that lets you copy across the settings from the parent theme to the child one, and vice versa.
All the necessary information about this can be found here – https://creativethemes.com/blocksy/docs/general/child-theme/. Check out the video tutorial at the bottom for a comprehensive explanation.
Also, please note that the customisations only refer to things such as the header layout, colours and similar. Changing the theme will not affect your page contents.
Hope this clears things up!
Thanks.