summation of numerical values stored in multi-layerd structs

If I had a multi-layered struct with numerical values, how would I go about adding all the numbers in the struct?

[Stephen23]

There is no magic to work with nested structures: just use loops and access the values, or use getfield. If you use a simple structure array without nesting then you can use comma-separated list:

https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html

https://www.mathworks.com/matlabcentral/answers/320713-how-to-operate-on-comma-separated-lists