Bubble app connector bi directional user access t DB

I have App A (main App) connected to App B (Sub app) users login to app B via App A credentials using the bubble App connector plugin.

So now i can ref in App B 'Current User (App A) things…all goodness but

I’m stumbling referencing whilst in in App A, things created under that user in App B …

SO my question would be how to i best reference A User in App A things they have created in App B?