Is there any way to modify or change the output file of Feko then reverse it and run

Hi guys
Could you please tell me is there any such method to do some reverse design using Feko. I mean can we modify any of the output file such as .out, .cfm or .pfs files so we can make a change on our original design then re run it again?. I need this specific technique to make a fine tuning on my structure by removing some part of the meshed segment.
thannk you in advanced