Blueprint 2D struct array

I have this var that is an array of a struct I made, and in that sturct is any array of strings. I can add a new sturct to the array that has an array of 3 strings, but the problem I have is that after I have added the new struct that had array of 3 I want to add one for to the array of string but it doesn’t happen. This is mainly a test for some other code I got that is an array of structs with an array of structs within it.

I manage to Solve it but getting the section I want to edit and store it in an another array, then add the new values to that array. I then remove the old section from the array then add the new one on to it.