Question on FF -> RH conversion

[Grant Hogarth]

I'm trying to move a FM book to RH to produce Eclipse Help output.
Where I'm breaking my brain is on trying to get the RH import to split 
off a new topic at each Level1 Head.
I've set the import (.isf) file to paginate on Heading1, but that does 
not seem to split the files as desired.
What am I missing?
(or do the FM files need to be split from chapters into 1-page topics 
separately?)

Thanks!
Grant