How to track the second touch after picking up an object?

Question

Unity

I can’t understand, in games it is often found that you click on a character, then you click somewhere else and he does something.

I need the same, but I will have several characters subordinate to the player. That is, the player clicks on any character, then clicks somewhere, and from where he clicked, a certain action will occur.

I've been scratching my head over this for 5 days already. Seriously. I can't find anything about it on the internet! I tried to write and do something myself, but nothing comes out. The last thing I stopped at was reycasts. But the problem is tracking this "second click", which, as it seems to me, is impossible to track.