Import my laptop's installation configuration file, just as a working example.

release/sysinstall/freebsd.cfg

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+# This is the installation configuration file for my laptop, fat.cdrom.com.
+# It is included here merely as a sort-of-documented example.
+
+# Turn on extra debugging.
+debug=yes
+
+# My host specific data
+hostname=fat.cdrom.com
+domainname=cdrom.com
+nameserver=192.216.222.3
+defaultrouter=192.216.222.225
+ipaddr=192.216.222.227
+netmask=255.255.255.240
+
+# Which installation device to use - ftp is pointed directly at my local
+# machine and the installation device is my PC CARD ethernet interface.
+ftp=ftp://time.cdrom.com/pub
+mediaSetFTP=script
+tcpInstallDevice=ze0
+
+# Select which distributions we want.
+distSetUser
+
+# Now set the parameters for the partition editor.  Set to use all remaining
+# free space (could also be "all" or "existing" to use all the disk or an
+# existing FreeBSD slice.  When the "script" parameter is passed to the
+# disk Partition Editor, it knows it's being run non-interactively.  Also,
+# since we have a DOS slice, we know the FreeBSD slice is slice 2.  This is
+# important to know for the label stage!
+disk=wd0
+diskSpace=free
+bootManager=booteasy
+diskPartitionEditor=script
+
+# It's bogus that we have to re-enter the label editor for each partition
+# we want to create, but it was easier to do it this way (from a programming
+# standpoint, not a user standpoint!).  This assumes that slice 1 is a DOS
+# partition and mounts it as /dos.  We also create a root partition of 20MB
+# size on the same pass since it's in a different slice.
+wd0s1=/dos N
+wd0s2=partition 40960 /
+diskLabelEditor=script
+
+# Now make a 20MB swap partition in the second slice.
+wd0s2=swap 40960 none
+diskLabelEditor=script
+
+# Size of 0 means allocate the rest of the space to /usr
+wd0s2=partition 0 /usr
+diskLabelEditor=script
+
+# OK, everything is set.  Do it!
+installCommit=script