将条件设置为UserForm中的combobox列表内容

Currently I am creating a simple user form for adding of new projects into the sheets. However, one problem I am facing now is that I have three different ranges of rows that consist of three different sizes of projects and their details. For example row 1 to 100 consist of big projects details, while row 150 to 250 is medium projects and row 300 to 400 is small project details. Thus by using the combo dropdown list, the user will select "big project" or "medium project" or "small project". Currently I am creating a simple user form for