How To Refrencing a data cells two different repeating groups

I need help my bubble users my friends i have an obsticle to my app so my question is,
How i refrencing a data for another repeating group cells for example i have two RG one is called A and the other RG B, in RG B i have cells data which contains data Product Name, Unit, and Product type, so i want to appear this data in RG B to RG A so how link to them?

any advice or suggestions my be usefull for me.

RG A’s data sources = RG B’s list of things?