I know you can drag parts from the top assembly into sub assemblies however are you able to work in reverse? I'm trying to pull parts from a sub assembly into the top assembly however I receive this error:

Which is odd since there is no component pattern in this assembly. Also it's a piping route assembly that I'm trying to extract the parts from, however they were originally in the top assembly then I dragged them into the sub assembly. However now I want them back in the top assembly.