How to create subtotal in cfgrid with groupfield.
This is my code

<cfform name="GridForm">
<cfgrid name = "FirstGrid" width = "775" height="400"
query = "Detail" colheaderbold="Yes"
font = "Tahoma" fontsize="12"
rowHeaders = "No"
selectColor = "yellow" selectmode="Browse" format="html" griddataalign="right"
groupfield = "#vgroupfield#"
insert = "no" delete = "no" >
<cfloop from="1" to="#ArrayLen(q_field)#" index="cloop">
<cfgridcolumn name = "#q_field[cloop]#"
header = "#q_field_title[cloop]#"
Select="No"
width="#q_field_width[cloop]#"
display="Yes"
type="#q_field_type[cloop]#"
dataalign="#q_field_align[cloop]#">
</cfloop>
</cfgrid>
</cfform>

Can you help me :
1. How to make a subtotal and grandtotal rows for every groupfield
2. How to make a subtotal and grandtotal for more than 1 grid column

Thanks
HH