How to Expand Partion?

We have a Dell PowerEdge 2900 Server (I'll call Server1) running Server 2008
(Standard Ed., I think). Created two virtual servers (VMServer2 & VMServer3);
both running Server 2003. Each of the servers has a C: partition and E:
partition. Server2 has run out of space on the E: partition. I purchased a
physical hard drive for Server1. I can probably figure out how to install
that on the PowerEdge but don't know how to allocate additional space to the
virtual server. Is it done thru the yper-V manager on Server1? Are there some
tutorials out there that would be helpful, easy to understand as I am a
beginner at Hyper-V.

Also, we use Symatnec Enterprise (with the Hyper-V agent installed) for
backing up. Will expanding that partition affect backup jobs we have
configured? I've had quite a few problems getting the Hyper-V agent to run
consistently. Maybe that's not a question for this forum?

Thanks much in advance!