Postprocess data after submit

Hi, I’am building an app with meteor and am using autoform. I want to postprocess the data after submit and before inserting, but I do not see how to trigger that. Can anybody help with that? An small example would be great.
Secondly, I want to merge two input fields into one and insert that new data, whilst ignoring the former two fields. Is that possible?
Regards, Roel

Check out autoform hooks, it allows to specify before/after submit, etc