Make a box appear / disappear depending on drop down form selection?

Is it possible to have a quick parts box box:-
Disappear if 1 is selected in the Drop Down Form Field (Person(s) Job
or for the quick parts box to appear if 2 is selected in the Drop Down Form Field.

The box I want to appear / disappear is the 2nd Person box.

I have tried messing around by recording a macro but I couldn't even get that too work.

Also would it be possible that if 2 is selected & thus the 2nd box is in use, then the hours that are inserted in the Area 1, Area 2 etc are split evenly between the Work fields in each box?

Your in appreciation & thickly :-)