Manually adding hitpoints help please?

I’d like to be able to add hitpoints manually precisely on every quarter note for part of a track. Can anyone explain how to please? Is there a way to make the 1/4 notes (beats) magnetic so they go there or something like that??

Cheers,

Axxe

Edit; What I have tried to do is;

In the sample editor…
Detect hitpoints
Put cursor on the beat that I want a hitpoint
Turn on edit hitpoints
Move hitpoint over the cursor and release

This works after a fashion BUT in the info above the sample waveform, the hitpoint might be, say, 3.3.3.95 or 4.1.1.0 or 4.1.1.1 etc. They are never EXACTLY on the beats and it is driving me insane.