input form/view changed based on a selection

[San_Tou]

Forgive me for not expressing this well in the topic.

I have a table, with ten fields, [type] has A, B or C, and [field 1], [field 2].... [field 9]

I would like to create a form, that allows me to select [type] as a dropdown box

if I select A, then only [field 2] and [field 9] will show

and there will be supplementary notes accompanying [field 2] and [field 9] to guide people how to fill the two fields. (I don't know if I can make the changes of the field's label, or an extra label next to it, or a popup when you click a button, to give that guidance)

in effect, the form will change based on the initial selection 

thanks