Dependent LOVs on custom object

Summary:

Content (required):

Hi there,

I am trying to fetch data from the standard fndlookup object where I have created a parent child field. In VB I want to show that parent child as two select lists. However, the fndlookup has a lot of data, when I tried to add a q parameter with lookup type filter, I was unable to save as example.

My question is what would be the best way to get only the data I want in the parent and then in the child I see only those under the parent. Do I use the filter criteria on the parent ?