How do I build an expression between a subform and a table

waterdamage

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I have been building my DB and learning everything from scratch. If anybody could give me any advice as to where I may be going astray, it would be much appreciated as I feel like I've hit a brick wall. I run a building firm and need a DB to look after customer information, write estimates, invoices and ultimately do the accounts.

I think my DB needs are very basic to start with and I'm guessing the system only needs to be fairly simple and straightforward. So far my DB has:-

• Customer form with an in-built Estimate subform - this form gives me a brief outline of the customer and how many estimates I have for him.
• If you then double click on an estimate number (in the Estimate subform) this takes you to my Items form (when I create an estimate normally in Word, I have to break jobs down into their components and price each item individually, hence I made an Items table). Each item has an Item Cost.
• I then run the report “Estimate” and have set up a total calculation box on the report ready to print it out for the customer.

My problem is that I would like to know how I can get the Estimate Total to appear in my Estimates Table and Estimates Subform. So far I have achieved making a crosstab query to calculate the Estimate Total (Amount) for each specific Estimate ID, but I cannot get the Total from the Crosstab Query into the Estimate Table, from which I would probably be able to get it into the Estimate Subform. I have a suspicion I need to build an expression in the Estimate Subform - but.....

Once I am over this problem I will want to turn Estimates into Invoices and have that data displayed in my Estimate Subform too, although I think I have got a good idea of how to do this, I would again be open to comments/advice if offered.

Thanks Steve
 
Estimate Total is a calculation

Therefore it would not be good practice to store this value. Calculate it as required

The Estimate data stored should include the detail, Labour, Materials etc. You can decide those

Then in teh query that produces Quote/Invoice just calculate sum

L
 

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