yes.
if you drop an object in child edition, it gets dropped from the child edition.
Still, you can access it from parent edition.
But, this is an EBR question , not an EBS question.
Read EBR related documents..
Here is a good one for you..
That scenario you are asking is there..
https://docs.oracle.com/database/121/ADFNS/adfns_editions.htm