[htmltmpl] Can HTML::Template do subtotals?

[LDT <per...@ya...>]

This is my first project using Perl and HTML::Template, and my first posting to this users list (after searching http://www.bluedot.net/mail/archive/ for things like "totals" and "total row" and "subtotal").  
 
I'm trying to figure out how to insert subtotals periodically and to calculate differences between two rows.  For example, this is a mock up similar to what I'm doing (mine is more complex):
 
accounts              curr month    year-to-date
10-19                       $xxx            $xxx
20-29                       $xxx            $xxx
30-39                       $xxx            $xxx
sub1 10-39                $xxxxx          $xxxxx
40-49                       $xxx            $xxx
50-59                       $xxx            $xxx
sub2 40-59                 $xxxx           $xxxx
grand total               $xxxxx          $xxxxx
diff b/w sub1 & sub 2       $xxx            $xxx
 
Right now, I'm using several case statements in my Sybase SQL and several unions (which I know is pretty ugly)...  but if I could get HTML::Template and Perl to play nicely together and let me generate occasional subtotals along the way (or differences as the case may be), that would be great.  Does HTML::Template have a way to do this?  I have the H:T documentation printed out (because I refer to it so often), and I'm wondering if a TMPL_IF might be the answer.  But, I can't wrap my brain around how I could use it for subtotalling and differences.
 
Oh, and feel free to dumb it down for me since I'm new to Perl, SQL, [insert language here].  ;-)
 
Thanks!
 
Lori
 
P.S.  I didn't include my Perl code because I wasn't sure if it would be necessary (and it's 600+ lines), but for the masochists among you, you can see it here along with the .tmpl file:  http://www.perlmonks.org/index.pl?node_id=108949&user=Lori713.  The .tmpl file is also included below:
 
<!-- Begin Summary Report -->
<TMPL_INCLUDE 'nc_start.tmpl'>
<TMPL_INCLUDE 'nc_style.tmpl'>
<TMPL_INCLUDE 'nc_titlebar.tmpl'>
<TMPL_INCLUDE 'nc_rpt_hdr.tmpl'>
<hr>
<form name=frm_summ_rept method=POST action="http://www.ncsu.edu">
<table border=1 cellspacing=0 cellpadding=1 width="100%" summary="Column Headings and Data Cells">
<tr valign="bottom">
<th width="9%">Account Summary</th>
<th width="18%">Description</th>
<th width="4%">Current FTE</th>
<th width="9%">Current Budget</th>
<th width="9%">Current Month Activity</th>
<th width="9%">FYTD Activity</th>
<th width="9%">Pre-Encumbrances</th>
<th width="9%">Encumbrances</th>
<th width="11%">Budget Balance Available</th>
<th width="4%">Future FTE</th>
<th width="9%">Future Budget</th>
</tr>
<TMPL_LOOP NAME=passacts>
    <tr class=<TMPL_VAR NAME=trclass> bgcolor=<TMPL_VAR NAME=bgcolor>>
    <td align="left"  style="cursor:pointer;cursor:hand;"
                      onmouseover="style.background='<TMPL_VAR NAME=bgcolor>';" 
                      onmouseout ="style.background='<TMPL_VAR NAME=bgcolor>';">
                      <font color=#000000><TMPL_VAR NAME=col_acct></td>
    <td align="left"  style="cursor:pointer;cursor:hand;"
                      title="Account(s) <TMPL_VAR NAME=col_acct>">
                      <font color=#000000><TMPL_VAR NAME=col_descr></td>
    <td align="right" style="cursor:pointer;cursor:hand;" 
                      title="Click to drill down"
                      onmouseover="style.background='#CCCCFF';" 
                      onmouseout ="style.background='<TMPL_VAR NAME=bgcolor>';">
                      <TMPL_VAR NAME=col_cfte></td>
    <td align="right" style="cursor:pointer;cursor:hand;" 
                      title="Click to drill down"
                      onmouseover="style.background='#CCCCFF';" 
                      onmouseout ="style.background='<TMPL_VAR NAME=bgcolor>';">
                      <TMPL_VAR NAME=col_cbud></td>
    <td align="right" style="cursor:pointer;cursor:hand;" 
                      title="Click to drill down"
                      onmouseover="style.background='#CCCCFF';" 
                      onmouseout ="style.background='<TMPL_VAR NAME=bgcolor>';">
                      <TMPL_VAR NAME=col_cmo></td>
    <td align="right" style="cursor:pointer;cursor:hand;" 
                      title="Click to drill down"
                      onmouseover="style.background='#CCCCFF';" 
                      onmouseout ="style.background='<TMPL_VAR NAME=bgcolor>';">
                      <TMPL_VAR NAME=col_fytd></td>
    <td align="right" style="cursor:pointer;cursor:hand;" 
                      title="Click to drill down"
                      onmouseover="style.background='#CCCCFF';" 
                      onmouseout ="style.background='<TMPL_VAR NAME=bgcolor>';">
                      <TMPL_VAR NAME=col_pre></td>
    <td align="right" style="cursor:pointer;cursor:hand;" 
                      title="Click to drill down"
                      onmouseover="style.background='#CCCCFF';" 
                      onmouseout ="style.background='<TMPL_VAR NAME=bgcolor>';">
                      <TMPL_VAR NAME=col_enc></td>
    <td align="right"><TMPL_VAR NAME=col_bba></td>
    <td align="right" style="cursor:pointer;cursor:hand;" 
                      title="Click to drill down"
                      onmouseover="style.background='#CCCCFF';" 
                      onmouseout ="style.background='<TMPL_VAR NAME=bgcolor>';">
                      <TMPL_VAR NAME=col_ffte></td>
    <td align="right" style="cursor:pointer;cursor:hand;" 
                      title="Click to drill down"
                      onmouseover="style.background='#CCCCFF';" 
                      onmouseout ="style.background='<TMPL_VAR NAME=bgcolor>';">
                      <TMPL_VAR NAME=col_fbud></td>
    </tr>
</TMPL_LOOP>
</table>
</form>
<TMPL_INCLUDE 'nc_buttons.tmpl'>
<TMPL_INCLUDE 'nc_end.tmpl'>
<!-- End Summary Report -->



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