Sum of Amount Field in a sub form to be made available outside the sub form in the main form field - Access 2013

Pl refer to the attached Access 2013 database file.

In the Form - FormDCEntry I have a sub form which captures the Invoicing Details.
How can I have a total Value of the sum of Amounts from multiple lines.
Say Amount of line 1 + Amount of Line 2 .... and so on getting automatically in the field "Value" which is below the Sub form.

My info.Delivery-Challan.accdb
Advait KawthalkarSr. Manager ITAsked:
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You need continuous form instead of datasheet. Look at sample
Advait KawthalkarSr. Manager ITAuthor Commented:
Thank you als315 for your suggestion and point well taken.

But what I want is how can that value be in the Value field which is outside the sub form.

 Pl refer to the attached screen shot.
Gustav BrockCIOCommented:
Even though the page footer cannot be shown in datasheetview, you can use it:

See attached file.

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Gustav BrockCIOCommented:
- and the file.
Advait KawthalkarSr. Manager ITAuthor Commented:
Thank you both for your help.
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