Hi I am trying to create a board similar to the one below, and I cannot figure out how to add the PCB for the nano inside a cut out of the outer PCB. Adding the cutout then placing the separate board inside gives me errors.
![backpcb.png](//image.easyeda.com/pullimage/dyRu6a7jM86ppXbTksjhVb9E6M35ex1UcAxxpeUN.png)