Templates are an essential part of using Word. VBA and userforms less so, but easy enough to follow when you have the code provided. See again
Create a userform and
Populate Userform Combo Box
I have modified the example to use your document content, which apart from the table is almost identical to the original I posted..
Put the contents of the zip in the same folder then create a new document from the template (File > New). I have also annotated relevant parts of the code.