There is no easy way but I just made a commit that fixes your problem. If 
you use trunk or wait for a next web2py version (within days) and you can 
do:

def stck_issue_manage():
    #form = SQLFORM.smartgrid(db.t_stck_issue,onupdate=auth.archive)
    grid = SQLFORM.grid(db.t_stck_issue)
    if grid.dbset:
         myrow=grid.dbset.select(db.t_stck_issue.f_sub_total.sum())[0]
         answer=myrow._extra['SUM(t_stck_issue.f_sub_total)']
    else: answer = None
    return locals()
VIEW
{{extend 'layout.html'}}

<h2>Manage stck_issue</h2><p>{{=grid}}</p>
<h2>All Issue Totals: {{=answer}}</h2>


On Wednesday, 26 July 2017 08:27:33 UTC-5, kesh wrote:
>
> hello sir
> i hope you are ok, well i have been having a problem with some code here 
> and have searched all over the internet but i was not able to get a solution
> MODEL
> db.define_table('t_stck_issue',
>     Field('f_name', type='reference t_items',
>           label=T('Name')),
>     Field('f_stck_client', type='reference t_clients',
>           label=T('Client Assgn')),
>     Field('f_stck_quantity', type='integer',
>           label=T('Stock Quantity')),
>     Field('f_unit_price', type='double',
>           label=T('Unit Price')),
>     Field('f_sub_total',type='double', compute=lambda 
> r:r['f_unit_price']*r['f_stck_quantity'],
>           label=T('Sub Total')),
>     auth.signature,
>     format='%(f_name)s',
>     migrate=settings.migrate)
>
> db.define_table('t_stck_issue_archive',db.t_stck_issue,Field('current_record','reference
>  
> t_stck_issue',readable=False,writable=False))
> CONTROLLER
> def stck_issue_manage():
>     #form = SQLFORM.smartgrid(db.t_stck_issue,onupdate=auth.archive)
>     form = SQLFORM.grid(db.t_stck_issue)
>     myrow=db().select(db.t_stck_issue.f_sub_total.sum())[0]
>     answer=myrow._extra['SUM(t_stck_issue.f_sub_total)']
>     return locals()
> VIEW
> {{extend 'layout.html'}}
>
> <h2>Manage stck_issue</h2><p>{{=form}}</p>
> <h2>All Issue Totals: {{=answer}}</h2>
>
> well it calculates the sub total field for all properly, but i would like 
> it to change when i filter by client to do the sub total for that 
> particular client only
>

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
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