What have you tried to copy the value?

I tried Forms![ProductTotal]! procedure. I have tried Dlookup.

In the Control Source of the field on the Parent form use this syntax:
=[SubformName]![FieldName]

Example:
=[OrderDetailF]![SumExtPrice]

That is just what I wanted! Thank you!

You're welcome.

Just one more question on this subject. I am generating a report on this form. I can't seem to move that field to my report and make it work. Any suggestions? By the way, I'll tip you as soon as I am set up on Paypal.

I was checking it is not putting the value in the table.

Sorry. I didn't realise you were storing the value.
You could do something like this in the On Current Event of the parent form:

If Not IsNull(OrderID) Then
    OrderTotal = OrderDetailF.Form!SumExtPrice
    Me.Refresh
End If

Value From a Form

I must not have things right.Is this supposed to be on the Parent form event  ON Current Tab?

Parent Form is Named ProductF. Subform is ProductDetailF. And the total in subform is SupplySum.

The code needs to go in the OnCurrent EVENT of the Parent form.
Open the Property Sheet for the Form and go to the Event tab.
Click on the Builder button (see screenshot).

I am sorry to keep bothering you. But that is where I put it. Do I have my forms named right in the event?

This is the error message I get when opening the product form.

Remove the code from there and click on the builder button (...) at the right. If you get the Choose Builder dialog, choose 'Code Builder' to open the Visual Basic Code Editor. This is where you need to enter the code.

Did you watch the On Current Event video?
Also: Intro to VBA.

I haven't got that far into the lessons. Is the builder button on Parent form properties?

Yes. See the screenshot I posted above. With the red square.

This is the error message I get now when opening the parent Form. I have also included a screen shot of where I put the code.

That's the Expression Builder. You need the Code Builder.

I am not getting the chance to Choose the Builder That option is not displaying for me. I am clicking on the 3 dot on the right but all that comes up is the expression builder.

Is this the right place?

Did you remove all the code you entered previously?

Yes. Now enter the code between the Private Sub and End Sub.

Yes, I removed it. Now I will put it in the right place. I have bothered you enough tonight, whether this works or not I will leave it as is till another day. Thank you so much!

Richard  -
In the picture I'm looking at it appears that you are trying to put your code directly into the property sheet instead of the code module associated with the form you are working with.
That is the reason you are getting the error.

So...
Try this:
1. Copy that code in the zoom box and paste it into Note Pad to save it temporarily.  Close the Zoom Box.
2. Now click in the blank "cell" to the right of On Load.  Press the Up Arrow on your keyboard once.  It should highlight the contents in the on On Current line.  Press the Delete key.
3. Now that we are sure that everything is out of the On Current, you should be able to click the   ...   button and it should bring up the Choose Builder dialog box.  Click Code Builder then click OK.

Follow Kevin's instructions from there using the code you pasted in the Note Pad.

I tried what you said and still an error. see images.

Check the name of your Subform object.

Here is a screenshot of what I have

I saw one problem with SubformID, so I changed it. Now I get this error message. I did watch the Intro to VBA video last night and the extended cut video. I have a little better understanding of what is going on now.