Resizing partitions with the Breezy Installer?

[Andreas Schildbach]

For final testing I'd like to install 5.10RC in addition to Hoary. Since 
the free space of about 1 Gig is too small for a decent Breezy 
installation, I'd like to make the Hoary partition smaller. I heard that 
this can be done with the Breezy installer. But I cannot find how, I 
searched all menus in the disk partitioner and the available help. Or is 
the resize capability just a hoax?

Regards,

Andreas