I looked further to my code and realised a couple of issues.
Initially, I used some Cesium functions that do not apply to this blueprint as I am not using Cesium data (get property table values from hit and get values as strings). I need to access the Building Data of each cylinder. This is my struggle now.
I did as you mentioned and created a function with UpdateData. I am still struggling to get it to work.
DataTable_InfoActor posted by R4k00n | blueprintUE | PasteBin For Unreal Engine