For basic OpenVPN configuration see: https://www.digitalocean.com/community/tutorials/how-to-set-up-an-openvpn-server-on-ubuntu-14-04
To create unified ovpn files:
#!/bin/bash
if [ "$1" == "" ]; then
echo "command line: <client name>"
exit 1
fi
OUT=$1.ovpn
cat unified_client.ovpn > $OUT
echo "<ca>" >> $OUT
cat ca.crt >> $OUT
echo -e "</ca>\n<key>" >> $OUT
cat $1.key >> $OUT
echo -e "</key>\n<cert>" >> $OUT
cat $1.crt >> $OUT
echo "</cert>" >> $OUT