This is what looks like when I set to zero the top and bottom layers in Bambu Studio:
How do I set so that there will be a border/frame left over with a non-zero top and bottom layer in order to look like this:

This is what looks like when I set to zero the top and bottom layers in Bambu Studio:
How do I set so that there will be a border/frame left over with a non-zero top and bottom layer in order to look like this:

Use a modifier the size of the cutout that you want with zero top,bottom and wall count.
Right click the model and “Add modifier”
Thank you! Related question: how do I center-align the modifier to the object to print (not to the center of the plate)?