Hi Nes,
This is the second time you are posting a variation on this question.
I was about to so NO YOU CAN'T...
but then I thought...
It is possible to print just parts of a front panel but it is a lot easier to do the things others have suggested.
If you really want to print just a part of the FP you will have to do a lot of coding and the GUI will do some strange things in the process.
I will outline the process and leave the code as an exercise for the reader.
Using property nodes determine where on the FP the objects of interest are located.
Again using property nodes, move the objects around on the FP so that they are grouped together and sized such they fit on a printed page.
Using property nodes adjust the screen size origin etc so only
the objects of interest are now visable.
Using.....nodes print only the visable part of the screen.
Using....nodes put everything back where is was when you started!
Like I said, this is not easy.
The simplest solution was suggested by BJD who said group the objects of interest on a tab page, use an invoke node to get the image and then display it on the FP of a sub-VI set to print on completion. That method will let you quickly add new interesting objects to the print out without having to change the sub-VI.
Trying to help,
Ben