Multiple aliased IP address when using VLAN's on 5.4

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Greetings,

I have a situation where I am using multiple VLAN's on one network card. 
      Until recently, each of those VLAN's was on a different subnet, 
and I had no issues.  However, now I need to add several different IP's 
on the same subnet to one of the VLAN's, but I have been unsuccessful. 
It seems aliases are not allowed when using VLAN's, and adding any other 
VLAN interface name on an identical VLAN does not work either..

Any tips?

-- Stephen.