John, it is hard to resume in a few lines how to do that, but here are
a couple books that helped me out and might help you
"Client Server Applications with Visual Foxpro and SQL 7"
"Building Visual Studios applications on a visual Foxpro 6.0 foundation"
and there are more,

check http://www.hentzenwerke.com/
also check www.wikis.com


>Hi,
>Could anyone give me some ideas how to implement pluggable business rule and also allow "inheritant"?
>
>I think to use table to store all rules, but I could not override rule, unless I have multiple copy of this table. Then it will be pain for maintenance.
>
>any suggestions?
>
>Thank you