Hi guys. I feel my English, I use the google translator. I have a schematic and circuit done but now I want to change the processor  or any other device. I change in the schematic and save and when I want to import in the pcb, it deletes all the components and puts them back, leaving the entire pcb deleted and misplaced when I only change one component, I don't change names or numbers. some help? Thank you   thanks so much