http://www.openbsd.org/faq/faq4.html
says

Install: load OpenBSD onto the system, overwriting whatever may have been
there.
Note that it is possible to leave some partitions untouched in this process,
such as a /home,
but otherwise, assume everything else is overwritten.

NOTE for re-installers: The new installer will not clear your old disklabel if
you chose "(C)ustom Layout",
but you will need to re-specify each mount point using the 'm' option in
disklabel(8).

when re-install OpenBSD, if we want to keep original /home's data,  are
following steps the key point?
1) let the space belong to original /home partition untouched.
2) not set /home mount point, add /home to /etc/fstab after install

If I have more than one partitions to leave untouched, to save more steps &
time,
I choose  "(E)dit auto layout" rather than "(C)ustom Layout"#,delete some
partitions, add some partitions carefully and leave mount point untouched.
the steps are not simple and error-prone, should we improve the installer ?

before  the step " Use (A)uto layout, (E)dit auto layout, or create (C)ustom
layout? [a] "
we add some step, for example:

Keep some partitions untouched? [yes]  Enter
Partitions' mount point?  ('?' for list) [/home]   ## Note that multiple mount
point can be listed, separated by spaces.

...

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