Many thanks for the prompt response. The issue with applying Sankey Diagram here is
There are 3 main fields (DATABASE - DATAMART - REPORT) for the visualisation.
Database has many tables and there are several columns in each table. With Sankey, I am not sure there is a way to collapse the tables, summing of arms is not required, just need arrowed lined with pointers if possible .
Please see the attached as an example where I attempt to collapse Table A,B,C,D. Table E has been expanded showing the columns and how it evolved to a metric/kpi