Cannot add or extend partition using file utility

Here's the problem.  I now have 18TB of Thunderbolt attached storage, it was 12TB that I previously partitioned all well and good.  I've added some drives and now I'd like to extend the partition, or at least add a second partition.
This is what I'm faced with:
Now I add the partition:
Notice that the '6' is greyed, therefore I can't change it.
So I submit 'Apply' and get this:
If I can't choose the size, I can't make it any smaller!
Advice gratefully accepted!
Andy

Kevin_
I had already done this, and left it 16.5 hours to migrate:
The disks in slots 1 and 2 were added.  It consistency checks OK as well.

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