[Zope] context syntax for subdir

[Tom Germaine]

Hello All:

I wish to upload a DTML Document to a subfolder of  folderA using a 
form and python script which reside in the parent folder of folderA 
and don't understand context well enough to designate subfolder 
properly.  The Document goes into subfolder based on it's filename 
and script looks something like:
....
if filename[0:4]=='abc':
  client=context.folderA(subfolderabc)  #fails at this line
elif ...
...
if hasattr(client,filename):  #test for existence, overwrite
client.manage_delObjects([filename])  
client.manage_addDTMLDocument(id=filename,file=myfile,title=
mytitle)  
else:
client.manage_addDTMLDocument(id=filename,file=myfile,title=
mytite)

How do I stipulate subfolderabc?

Tom Germaine