Reza Rad shows us how to build out a substring using DAX:
Substring is one of the most common functions in many languages, However, there is no function named Substring DAX. There is a very simple way of doing it, which I am going to explain in this post. Substring means getting part of a string, for example from “Reza Rad”, if I want to get the start starting from index 2, for 4 characters, it should return “za R”. Considering that the first character is index 0. Let’s see how this is possible.
The answer’s not as pretty as a SUBSTRING() function would be, but it’s also not too far off.