[@](https://easyeda.com/dario.sermasi2012)dario.sermasi2012, Not sure I understand your question but "Learning Through Play" is a good idea here. Build yourself a simple dummy schematic and convert it to PCB then play with it to see what happens. :)

Thank you for the speedy reply. I tried as you wrote but I didn't solve the problem. I try to explay: in a circuit with all the components I have inserted about 20 SMD resistors, all connected to integrated circuits. In the PCB I have already placed the resistors so that the PCB is simple to make both as a PCB and as a component assembly. I then realized that I was wrong: instead of SMD resistors, it is much easier for me to mount resistors with leads to be soldered in the PCB plane below. In the PCB no problem as to space (the SMD resistor is much smaller than the one with the leads, but I have set a lot of space, to facilitate assembly). I started replacing an SMD resistor with the equivalent with leads: one at a time. Then I update the PCB; EasyEDA asks me "I remove the SMD one; I insert the new one. Is it okay?", I give him the OK; in the PCB I find the new resistor (while the SMD one has been canceled). But then I have to place it where it needs to be. It is not a great effort. But I think (but I can be wrong) that there is a setting, with which I tell EasyEDA: "When I replace a component, put the new one exactly where the old was". I hope I have explained. Thank you in advance, Dario

@dario.sermasi2012, Try this: 1\. Change the resistors in the schematic; 2\. Save the schematic; 3\. Then\, in the Schematic do:  4\. Save the schematic; 5\. Then in the PCB do:  6\. Save the PCB; 7\. Then \(in the PCB\) do:  You will still have to re-route and may have to reposition the resistors so it does not help too much. :)

Thank you! In the afternoon I shall try. Dario