No, you can expand most Virtual Disks, but you cannot shrink them. You will need to start over on this, creating one VD smaller than 2TB for the OS/boot disk, then the remainder can be used in another VD.
I've got Windows Server 2003 installed on a PERC H700 RAID-5 virtual disk. Total disk size is 5.5 TB. The problem is that WinServer 2003 can't use all of the disk due to the 2TB MBR limit (and I can't convert to GPT without wiping out all of the partitions, which is what I'm trying to avoid). Since 3.5TB of disk space is unallocated (and unallocatable), is there a way of reducing the virtual disk size to remove this space that can't be used anyway? I could then using the remaining capacity to create a new virtual disk that can be set up as GPT and access the remaining space through it (or two new virtual disks 2TB and 1.5TB in size). I know you can expand a virtual disk, but can you shrink one?
Reduce size of RAID 5 virtual disk