If you have v9.3, it looks like the new Union functionality should serve your purposes:
If you don't have that version, will think about it some more.
I am using Tableau 9.0, however the union may not work in may case because I need to merge columns with different names (e.g., column A and A' to be merged into A); the union will create 2 distinct columns (A and A') because the column names do not match (http://bival.de/wp-content/uploads/2016/03/Coming-Soon-in-Tableau-9.3_Beta4.pdf).
1 of 1 people found this helpful
This is true. But you can select the two columns and merge them.