I have a small request for Unity 2D: please can we have the ability to select a group of tiles and move them around our scene? I tried the Move tool- it does nothing, as if tiles were insubstantial.
How's that accomplished? And in reply to your question- yes, this one believes we first met in TESA. Hello again!
Create a tile and drag it in the hierarchy view and it will be a game object to which you'll be able to add scripts, colliders, rigidbody if necessary, and so on. If you are completely new to this, I recommend that you make this tutorial: https://learn.unity.com/project/ruby-s-2d-rpg
I'm not sure if I've understood your question well. If you ask about selecting tiles that you have already drawn on a tilemap instead of erasing them and drawing them again elsewhere, there are "select" and "move" tools in the tile palette: https://docs.unity3d.com/Manual/Tilemap-Painting.html