drop list populating cell

Hi all,

I'm trying to make a drop list and once a selection has been made on the drop list, the sub categories will appear in the next cells. Someone on the forum has already helped me on this using IF(ISERROR(VLOOKUP. The question here is, how do I input numberical data on the right side (to find out how many hours I have input for each week) *Note, I want it to display it on the example worksheet? Please see attachment