"When saving the results I don't really care what is in the table, I just want to put the result to the last line "
That's fairly straightforward. Are you storing the data in a table variable or a uitable? Do you know the maximum number of rows and number of columns? Could you provide a small example of the table so we can see what kind of variables you're saving?
"...so I'm interested in a process which can do that in an asynchronic manner without blocking the user from interacting with the GUI until it's done saving."
The last part is achievable but what do you mean "in an asynchronic manner"?