How to mark photo during taking a photo (700D)?

[MiPaz]

Hello,
I was looking for it without good result, so I hope I am not duplicating some topic.  I would like to mark some photo during taking photo (or short time before it or immidiatelly after this). I know I could mark with * in "Play" mode, but it takes a long time. We are using it in our job to take a some documentation photo and some of pictures we would like to use (copy) also to another destination. So idea is to mark it and in postprocessing script do what we need. best could be press some key during taking a photo if we would like to mark it. Please, is there something like this?
I didn´t find it on the forum, is there some simple possibility? Thank you very much,
MiPaz