How to show filtered(by selection) data?

This is kinda hard to explain..
One of my table have external links...
Table is Called 'Manuals'
there is ID,manufacturrer,Type,year.link
So what is goal?
I need page where user can select first 'manufacturer', than depend on that selection to select 'Type', than
depend on previous 2 selection to select 'year', and after that to see list of related ( mached ) links...
In these sellection fileds 'Type' and 'year' can be empty.
how to do that?
Also I need a way ( for Administrator, and MODERATOR ) to put links in table 'Manuals'...
tnx
One of my table have external links...
Table is Called 'Manuals'
there is ID,manufacturrer,Type,year.link
So what is goal?
I need page where user can select first 'manufacturer', than depend on that selection to select 'Type', than
depend on previous 2 selection to select 'year', and after that to see list of related ( mached ) links...
In these sellection fileds 'Type' and 'year' can be empty.
how to do that?
Also I need a way ( for Administrator, and MODERATOR ) to put links in table 'Manuals'...
tnx