In short, prior to take off by pressing the CAT A button on the collective you select the takeoff you wish....helipad, shortfield, open area etc which is displayed on the PFD.
On the PFD you then get a PI reference for the selected takeoff, a TDP reference height (with aural alert when your there) and a lovely horizontal magenta line on the ADI to follow as the takeoff progresses....ie at the tdp you follow it to 10 degrees nose down, 0, 5 up etc.
Well something like that.
Turkey