resize disk space on vm

hi!

I have a little problem, when I converted a vm to my esx server so did I choose 14GB for the vm.

But I have now realize that I need more space on the vm. but the problem is that I shutdown the vm and

grant more space but the does not get more space just none alcolated in diskmgmt. and by that I will have to

make a new partition.

Can i add more disk to C: by not formatting the disk? or can i add more diskspace to a new partition

(if i add 20gb more now and want to add 20gb extra to the same partition in 2 months or something like that?) ??

thanks

/R