Text box mirror

Question

Hello every1, I am working on a project where my textbox1 is used to generate textbox1 to 2 to 3. My textbox10 is supposed to get the value of the textbox no that is on textbox1. For example textbox1 text value is “textbox2” how can I get textbox2 value by referring to textbox1 whose text value is “textbox2”? Thanks