Drop Down List Dependent on Previous Drop Down List

Hello,

I am trying to make a selection sheet for my company. I currently have a drop down list to choose different level front doors that can be installed. I need a second cell in yellow to show in a drop down list the options for the level door that was chosen in the previous cell. Attached are a couple pictures showing what I have done. Any help would be greatly appreciated. I tried to do a vlookup and a drop down list and tried to combine them but haven't been able to get them to work. I would attach my current worksheet but the post is not letting me.

Thanks for all the help. I really appreciate it.

Front Page.JPGOptions.JPG

That looks like it is what I am looking for. Thanks a bunch for the quick response. I really appreciate it.