DAX Date Sorting (Again)

Hmm, first, you should be able to replace:

Date Ranges = IF(MONTH(Sales[Doc Date]) = 1, "January", IF(MONTH(Sales[Doc Date]) = 2, "February", 
IF(MONTH(Sales[Doc Date]) = 3, "March", IF(MONTH(Sales[Doc Date]) = 4, "April", 
IF(MONTH(Sales[Doc Date]) = 5, "May", IF(MONTH(Sales[Doc Date]) = 6, "June", 
IF(MONTH(Sales[Doc Date]) = 7, "July", IF(MONTH(Sales[Doc Date]) = 8, "August", 
IF(MONTH(Sales[Doc Date]) = 9, "September", IF(MONTH(Sales[Doc Date]) = 10, "October", 
IF(MONTH(Sales[Doc Date]) = 11, "November", IF(MONTH(Sales[Doc Date]) = 12, "December", 
"Error"))))))))))))

with

Date Ranges = FORMAT(Sales[Doc Date],"mmmm")

Then you need to relate your Month table to your fact table. Then you need to do a Sort By on your Month column in your Month table with your Sort column. Then you need to use your Month column from your Month table in your slicer.