CheifNewB,

To automate the calculation you will need to set up your template as a
protected form.  You should get a good start here and the linked articles by
Dian Chapman:

http://word.mvps.org/faqs/customization/FillinTheBlanks.htm

You can semi-automate calculations using formula fields and then updating
the fields.  Let's say the hours worked are in a column.  At the bottom put
the field {=sum(above)}.  The field code braces { } are entered with
CTRL+F9.  Toggle the field code to display the result with ALT+F9.  When a
change is made, you can update the field by selecting the field and pressing
F9, or update all fields by pressing CTRL+a (selects all) and pressing F9,
toggling to and from print preview (if "Update Fields" is checked in the
File>Print>Options dialog box), or running a macro something like:

Sub UpdateFields()
Dim oStory As Range
 For Each oStory In ActiveDocument.StoryRanges
     oStory.Fields.Update
  If oStory.StoryType <> wdMainTextStory Then
  While Not (oStory.NextStoryRange Is Nothing)
      Set oStory = oStory.NextStoryRange
      oStory.Fields.Update
  Wend
  End If
 Next oStory
Set oStory = Nothing
End Sub