You can start by Hiding all the unnecessary fields by making them
'invisible' on their object pallet. Then you can right click the
dropdown box that you want to be the trigger, and select actions. Here
you can create conditions such as: When dropdown text 'comp' is
selected, make field 1 visible.I believe you can group several related
fields together by wrapping in a subform, then you should be able to
unhide the entire subform in one action.I'm fairly new to this too, but
this has worked for me...