Dependent Combo Box Problem!

Hi,

Really sorry if a solution have been previously posted but I wasn't able to find one that I could adapt =(

I have a sheet (see attached)

Pretty simple

2 sheets

Rawdata and Lookuplist

If you press button 1 on lookuplist sheet, it brings up a user form, I was able to populate the first comb box with unique site names, what I have no idea how to do is, make combobox 2, then give you the category options that are available based on the selection in combo box one (site name) and then for combo box 3 the list should depend on what options are selected in 1 and 2.

If anyone knows how I can do this - it would be a massive help!

I hope that makes sense

PB