Display large content from rg in another rg on scrolling

Hello bubblers, am creating an app which has a RG that is scrolled with two icons to show next or previous. However, i want when i scroll data from repeating groups to display up as a large item in the second repeating group.

so you see the large imageon the left : it comes from the four small images when srolled

You can set a group and when you click or hover an item, you can update this group data source to display the correct image.