For a drive that might be inserted into multiple OSes, I recommend you start with an MBR. You can use fdisk(8) to create an MBR. The initialized (or reinitialized) default configuration is of a single OpenBSD MBR partition spanning the drive. The fdisk(8) program has an editor which can revise these, or make GPT partitions instead of MBRs. However, some knowledge of how MBR/GPT partitions function is needed to effectively make changes.
To create a default, initial MBR, you can use # fdisk -iy <device> . See the man page for details.
As you noted, you can create OpenBSD disklabel partitions with disklabel(8) and its editor.
Formatting of FFS partitions in OpenBSD is performed with newfs(8).
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