Windows Vista Creating 2nd Primary Partition in Hm Prem 64-Bit

I'm assuming I can, but is there a "Best way" to create a 2nd Primary partition of Vista using it's own OS?

Thanks,
GPL

 

Presumably you want to reduce the size of C and create a new partition from the unallocated space?

If so:
Right-click Computer > Manage > Storage > Disk Management. Right-click the graphic of drive C, choose Shrink Volume and the amount of space to shrink it by then click Shrink. Right-click on the new unallocated space, click on New Simple Volume, give it a meaningful Volume Label and run a Quick format.

When you Shrink a partition, contiguous, unallocated space appears to the right of the shrunken partition. Also, it can only decrease the partition size down to the first unmovable/locked system file. Running a defragmentation may move some of the ‘unmovable’ files. Also, if you’re running System Restore, you could try temporarily turning it off, do the Shrink and turn it back on.