Well actually, yes you can call the Form_Current of the main form. However, you need to change from "Private Sub Form_Current" to "Public Sub Form_Current". Beware, that can make things very confusing, especially if you try to do that with more than one form...
A better way to do this is to create a "Public Sub UpdateTotals" procedure in the main form, or any module (which is what dartcoach was really asking), and have the Form_Current of your main form call that. Other modules and forms can call it too. If you create the UpdateTotals in something other than your main form the procedure won't have a context for the fields of your main form which means you'll have to use specific reference to the form to update the fields (e.g. Forms("main_formname").field_name). So the best bet is to have that procedure in your main form.
Also, watch out for that Current event, especially in your child forms! It runs for so many different reasons... often multiple times.
Randall J Weers
Membership Vice President
Pacific NorthWest Access Developers Group