Cat3750 Standby Group limitation

Hello,
I got a problem regarding the limitation of standby groups. As you can see below, we never put the vlan interfaces in groups, so they`re all in group 0 by default. Now, by trying to add another virtual interface to one of the two core switches, i got an error message that the amount of groups is limited to 32. I dont understand that. In my opinion, all interfaces are in group 0 ?!?
Even if i try to put, for example, interface 402 in another group, the error message appears.
Besides i`m still not sure what that groupes are made for, what`s best practice for this scenario?
thanks in advance
Interface   Grp Prio P State    Active          Standby         Virtual IP
Vl1         0   120 P Active   local           172.17.101.253 172.17.101.254
Vl21        0   120 P Active   local           172.17.1.3      172.17.1.1
Vl201        0 120 P Active   local           172.17.202.3    172.17.202.1
Vl203      0   120 P Active   local           172.17.201.3    172.17.201.1
Vl202       0   120 P Active   local           172.17.203.3    172.17.203.1
Vl204       0   120 P Active   local           172.17.204.3    172.17.204.1
Vl205       0   120 P Active   local           172.17.205.3    172.17.205.1
Vl206       0   120 P Active   local           172.17.206.3    172.17.206.1
Vl207       0   120 P Active   local           172.17.207.3    172.17.207.1
Vl208       0   120 P Active   local           172.17.208.3    172.17.208.1
Vl209       0   120 P Active   local           172.17.209.3    172.17.209.1
Vl210       0   120 P Active   local           172.17.210.3    172.17.210.1
Vl211       0   120 P Active   local           172.17.211.3    172.17.211.1
Vl212       0   120 P Active   local           172.17.212.3    172.17.212.1
Vl213       0   120 P Active   local           172.17.213.3    172.17.213.1
Vl214       0   120 P Active   local           172.17.214.3    172.17.214.1
Vl215       0   120 P Active   local           172.17.215.3    172.17.215.1
Vl216       0   120 P Active   local           172.17.216.3    172.17.216.1
Vl217       0   120 P Active   local           172.17.217.3    172.17.217.1
Vl218       0   120 P Active   local           172.17.218.3    172.17.218.1
Vl219       0   120 P Active   local           172.17.219.3    172.17.219.1
Vl220       0   120 P Active   local           172.17.220.3    172.17.220.1
Vl221       0   120 P Active   local           172.17.221.3    172.17.221.1
Vl222       0   120 P Active   local           172.17.222.3    172.17.222.1
Vl223       0   120 P Active   local           172.17.223.3    172.17.223.1
Vl224       0   120 P Active   local           172.17.224.3    172.17.224.1
Vl225       0   120 P Active   local           172.17.225.3    172.17.225.1
Vl226       0   120 P Active   local           172.17.226.3    172.17.226.1
Vl227       0   120 P Active   local           172.17.227.3    172.17.227.1
Vl228       0   120 P Active   local           172.17.228.3    172.17.228.1
Vl250       0   120 P Active   local           172.17.250.3    172.17.250.1
Vl402      0   120 P Active   local           10.20.0.3       10.20.0.1

When you configure the virtual blade network interface card emulation in WAAS version 4.1.1c or 4.1.1d, you can select E1000 (an Intel E1000 NIC emulator) in addition to the rtl8139 and virtio emulators.
For more information on mapping the Virtual -blade to the NIC, please follow up on this link:
http://www.cisco.com/en/US/docs/app_ntwk_services/waas/waas/v411/release/notes/ws411rn.html#wp64158

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http://download.oracle.com/docs/cd/B19306_01/server.102/b14239/create_ps.htm#i1225703
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From the Docs.:
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I'm just not sure how to go about that.
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Cris

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