Cascading user form combo boxes?

Hi all.
I have a workbook that I'm using fpr courses booking, it has a combo boxes so that I can select manager name, area and delegate name and click command button which puts all information onto the list. Its ok but I would like to use the userform instead of spread sheet to capture data.
I tried to copy the code from worksheet to userform but somethig is causing an error. I would appreciate your help in this matter.
Thank you in advance.