There are two methods that you can use to combine coverage data: the first being done at the command line and the seconds through the coverage Results Explorer UI
To combine coverage data at the command line, you can use the '+' operator to get the union of the cvdata objects:
Alternatively, you can use the coverage Results Explorer to load all of your coverage results for the model from the folder in your screenshot, and combine all of the results into a single cumulative coverage that can be saved:
You can also indicate the need for cumulative coverage collection prior to simulation using the Configuration option under Coverage > Results > Advanced Parameters
