Need Dependent Cell validation list

I am trying to develop a professional services matrix where i have the services identified and a base level of effort assigned. I then have separate lists for the LOE levels and hours that would apply for each LOE. What I want is when you select the service offering, it will populate the Level of Effort column automatically and let you choose from the drop down the hours assigned to that LOE. I know this is pretty simple but my brain is fried now at the end of the week,. See attached file.

Thanks,

Hank