Another calculation for Tree database: getting the figures from another form

As long as this site keeps giving points to the person who answers me, I can keep asking right?  :)  

Again, I tried some things but couldn't get anywhere on this one.  On a positive note I still continue to add things myself by figuring them out.

On frmLogs I added the column "Gross".  This calculation works and is Footage * Grade.
Footage * Grade
I need to add this Gross column up and put it on frmTrees.  Here:
frmTrees
I cannot figure out how to get access to the calculation of "=[txtFootage]*[cboGrades]" in frmTrees.  

Other Notes
In frmTrees, with your help, there is a dsum that adds the total log footage which is right and good.  I cannot just take that total and multiply it by something, because that something is different for each log.  See first picture, the multiplier is different.

Sample Result
For example.  Screenshot one has the gross of 320.0 and 23.8.  I need to add 320.0 and 23.8.  So that equals 343.8.  That number, 343.8, needs to go in  the Gross column for Tree # 4 in frmTrees.  Like so:
Example
Hopefully I have gave all the information needed.  Please let me know if you need anymore information.

and Thank you!
Database1683--2-.accdb
getwidth28Asked:
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mbizupConnect With a Mentor Commented:
Try this as the control source, including the  = .

=DSum("Grade * Footage","tblLogs","TreeID = " & [TreeID])

Open in new window


Same principal.  You're summing the product of Grade and Footage for a given tree ID.
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mbizupCommented:
For the type of data you are trying to pull, again I highly recommend reading Jim Dettman's article:

http://www.experts-exchange.com/Microsoft/Development/MS_Access/A_12-Dlookup-and-the-Domain-Functions.html

It focuses largely on DLookup, but the same principles also apply to all of the domain functions (DSum, DMax, DAvg, etc).
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getwidth28Author Commented:
Shucks, I forgot to read that.  I will right now, then try your answer.
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getwidth28Author Commented:
I understood the article fully.  What is a little confusing is how does Access know to use the Grade and Footage value from the frmLogs form vs. the tblLogs table.  There is not footage or grade column in the table.

??

BTW: It worked perfectly, again.  Thank you
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mbizupCommented:
DSum, DLookup, etc allow you to look at sources off of the form... in this case, the Trees form does not have the needed data, so you want to query the Logs table  -- which has Grade and Footage.

The DSum command lets you do that, and also allows you to use criteria from the form in the sum.
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getwidth28Author Commented:
I was wrong.  It seemingly worked at first but then after I added another tree, the "Total Gross" stays the same and doesn't cycle through the other trees and add them.  

The total shown is simply the record selected.  If I select the top record (Tree #2) the "Total Gross becomes 67.1.  If I select the other record (Tree # 1) the "Total Gross" becomes 18.

12
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mbizupCommented:
I thought this question was about populating txtGross in the continuous form as you showed with the red number in the image in your original post.  ?

Is this a new/follow up question, or was that not what you were looking for?
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mbizupCommented:
The Total Gross textbox was not in the sample you posted.
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getwidth28Author Commented:
Your are right.  I got to working on another thing and got them confused.  I will close this out and get the answer marked.

I believe I know how to get the next total that I need using 2x SQL queries with the do until eof but I can't get it figured out with a DSUM.
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