Terry,
I thought I'd add some additional thoughts. It is possible to transition with a single disk, retaining the NTFS partitions you want to retain, but the risk of data loss is extremely high. I've been using OpenBSD for 13 years, and yet I would still back up these partitions before attempting it.
1. Back up the data on the filesystems to be retained.
2. Run the install script, assigning a GPT or MBR to the entire disk. Some systems do not have legacy boot and require GPT.
3. Do NOT accept the auto disklabel(8) partitioning. Instead, deploy custom partitioning. Include the NTFS partitions in the disklabel, using the starting sectors and sizes from the prior GPT. Do NOT give the NTFS partitions mount points. The install script would attempt to format any mount points selected.
Is this ugly? Yes. Is there a high risk of data loss? Yes. Would I do this? No.
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