adding a new disk to storage array to expand repository size

I have a 6TB repository on a NAS storage array that is getting full. I've added an additional 2TB drive to the array but haven't yet done anything with allocating it, creating partition, etc. The partition that I have created for the repository is "G", but for some reason, it's shown in the drive management screen in 2 parts. The new 2TB is shown unallocated to the right of the G's.



1. Can a repository simply be expanded/enlarged or do I have to add a storage location to the repository?

2. depending on the answer to #1

   - if I can expand the repository, can I simply select the Repository G partition immediately to the left of the unallocated space and expand it into the new space without screwing up the repository that currently resides there?

   - if I have to "Add storage location" to increase the size of the repository, should I create a new partition in the unallocated space instead of expanding the existing G partition?