[AccessD] Crystal 2008 Question

I don't know if anyone can help me with this question but here goes:
 
I am trying to create a crystal report with groupings.  In the detail records, I 
have field (Field 1) that is averaged in a group 1 footer field 
(Footer1-Field1).  That works fine.  My issue is when I get to grouping 2.  How 
do I sum Footer1-Field1?  When I click on the field and and choose Insert, 
Summary; I do not get an option for Summing (I get Maximum, Minnimum, Count, 
etc.).  It appears that Crystal is seeing Footer1-Field1 as a string (or is 
something else is going on).  If I could sum each of the Footer1-Field1 fields 
the problem would be solved.  

 
If I click on the orginal field (Field 1), I can select the option insert, 
running total.  I do not get this option when I click on the group 1 footer 
field (Footer1-Field1).  Can I not total a footer field as I would in Access.
 
 
Thanks!
 
Dale