Add PPC updates to local x86 yum repository

Hi all,
I have a local RHN repository to update my RHEL x86 servers. Now, if is possible, I want to add PPC and PPC64 updates to the repository and configure PS700 to take updates from the local repository instead of the remote one(now PS700 have no Internet connection). 

I've create a .repo file in /etc/yum.repos.d containing this:

[RHEL-PowerPC]
name=PowerPC Red Hat Enterprise Linux
baseurl=ftp://public.dhe.ibm.com/software/server/POWER/Linux/IBMITSST/RHEL5/IBM
enabled=1
gpgcheck=1

But when I try to update the local repository, it doesn't download the packages from that repo.
Also I've modified the yum.conf and modified the 'exactarch' value to 0.

Is possible to do it? Also, how can I do it? 

Thanks