ADDCOLUMNS and actual values return (e.g. text string)

The issue is that SUMMARIZE requires the initial <table> argument and there is no single table within the entire model that contains / correlates all values types ("A" --> "B" --> "C").  The other issue is the relationship type/flow from tables.  For example, the table referenced within SUMMARIZE is table 3 - "T3 EDL to DWGS"- and value Type "C" columns are located in table 7 ("T7 EDL to NEEDS Table") which correlates Type "B" and "C".  I've tried to use RELATEDTABLE() but it will not work due to multiple changes in table relationships (many-to-one, then one-to-many, then many-to-one, and lastly one-to-many again as T7 is reached)