Grand Total based on calculated sub-group field

I have a MS Access Database that track products through 3 different departments.  The report that I have groups items by Item, then by Department then by Operator. I have a calculated subgroup fields (in the department footer) that takes the 1. [SumOfQty] / [SumOfTime] and 2.  [SumOfLaborCost] / [SumOfQty]

Now I want to get a grand total of these calculated fields in the Item Footer. But everytime that I try and reference the calculated field and run the report, it pops up asking for the parameter to be entered.

I have added two files to help explain.

How can I add the sub-groups total lines to a Grand total when they are a calculated field?
Rpt-Problem---Print-Preview.jpg
Rpt-Problem---Report-Design.jpg
Dan SheridanSenior System Eng / vITMAsked:
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Jeffrey CoachmanConnect With a Mentor MIS LiasonCommented:
Something like this perhaps:
Database171-1-.mdb
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Jeffrey CoachmanMIS LiasonCommented:
If I am understanding correctly, ...If it were me, I would do your two calculations in the Reports recordsource, then you could just bring these in as fields( ex: SumOfQtySumOfTime), then you get any summary you wanted  with something like this as a textbox control source:
=Sum([SumOfQtySumOfTime])

JeffCoachman
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Jeffrey CoachmanMIS LiasonCommented:
something like this:
Database171.mdb
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Dan SheridanSenior System Eng / vITMAuthor Commented:
Let me see if I can clairify so more. I'm getting all the calculations except when I try and add the calculated field into the item footer for CostPerPeice.  I cannot just do a total sum because it would count all depts several times

Looking at your example I have made some modifications so you can see.  
In the new example, let say you cannot simple add all depts as a total so you calculate the subgroup then sum that calculated field. Open the report in design and /or try and run the report.
Database171.mdb
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Jeffrey CoachmanMIS LiasonCommented:
< I cannot just do a total sum because it would count all depts several times>
Not sure I follow...
In my sample, it counts and sums each group only once...

Based on my sample post a clear graphical representation of the *exact* output you are looking for here (based on the exact numbers in my sample)
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Dan SheridanSenior System Eng / vITMAuthor Commented:
Great (screen shot to show how it works.
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Dan SheridanSenior System Eng / vITMAuthor Commented:
Excellent. Problem solved.  I didn’t even think (or know) about the “running sum” function under the properties data tab.

Here’s what I did to fix problem with the help from “boag2000”.

Copied the calculated field into the same group footer and then made the Visible = “No” with a name of the field called “txtSumCPP”.  Then in the Item footer group I made the control source of the total field equal to “=[txtSumCPP]”.  The reason that you need to make a second item is it will keep the running sum in each group footer and would not know what the total for that group was.  I have a screen shot attached to show that it works correctly.

Thank you so much for your help.
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Jeffrey CoachmanMIS LiasonCommented:
No problem
;-)

Sorry I misinterpreted your original request
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Jeffrey CoachmanMIS LiasonCommented:
dsheridan,

And congratulation on investigating the sample extensively on your own to find the "Running Sum" property...
Typically most people will just say "How'd you do that?"

...and you repaired your own report without any direct help form me.

Congratulations, Great work!
;-)

JeffCoachman
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Dan SheridanSenior System Eng / vITMAuthor Commented:
just neede a nudge in the right direction. Thanks again..;-)
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