Consume all email subdirectories from a parent directory

[kastnerp]

Say I have a parent directory that contains many subdirectories with documents to consume:

+-- parent folder
   |-- sub_1
   |-- sub_2
   |-- ...
   |-- sub_n

Is there a way to consume all subdirectories via IMAP from a parent directory? In other words, do I have to specify a rule for each subdirectory or can I work with wildcards e.g. "*" somehow?