Hi ,
If I understand you correctly, you’re looking to edit a variable from Blueprint #1 in Blueprint #2. The best way to do this would be to cast to Blueprint #1 from Blueprint #2’s event graph. When you cast to another blueprint, you can access all of it’s public variables and functions.
All you need to do is to add the node (Right click in the event graph and type ‘Cast to’ followed by the blueprint’s name) and then in the drop down box inside the node, select the blueprint you’d like to cast to. After that, you can drag from the ‘As blueprint name’ pin and type ‘Get’ or ‘Set’ followed by the variable name to access it.
I hope this helps!