How to connect models with the mouse in Unity3d?

Question

JavaScript

It is required to connect two models together in the game. The meaning is this: hold LMB on one model and without releasing drag it to another, as a result, the first model is attached to the second.

Answer 1

Attached how? As you bring it up, it fastens or jumps on some kind of special. designated place?
There are many nuances here. Whether all bodies can be attached to each other or some to one.

Answer 2

It may be useful to look at the layout of the crafting editor in the Kerbal Space Program. There it is sensibly made (at least the process of connecting parts). There is a radial fastening, and at certain points (on the "nodes").