SUM a currency in BPMN Flowchart

[Azraelz]

I need to sum a currency field from related entity to my field in other entity, is that possible using bpmn flowchart formula?...

[Azraelz]

any idea which file i can edit for custom it?

[Azraelz]

My users want admins to not have access to read those sensitive fields, although admin still need to have access to the administration menu for the purpose...