Access 2103 Web App: How to create a data macro calculation to update a field

Quick & simple; have to fields and want the third to calculate and then update a third field.  The key if I'm asking right is the 3rd field exists in the table, I just want it "filled in" based on values of the other two fields.

Advice to date is use a data macro.  Could use a little more step by step feedback...
VirtualKansasAsked:
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Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
Better advice would be to NOT store calculated data, and instead use a query to provide that calculation "on the fly" - something like:

SELECT Field1, Field2, Field1 + Field2 AS [TotalField] FROM YourTable
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VirtualKansasAuthor Commented:
Exactly how we do it on desktop.  ...and to add luster to this advice, since we're (all) new to the app. db, we experimented with macros and found our limits in that testing a macro to update the actual field value was inadvertently creating new blank records.

In the interim, to display in the web view we simply created a new control that's source is the two fields for the calculation and disabled it in format.  

The calculation is done in the view and presented in the view in a "read only" field.  Now we get to exercise creating queries in the app. but short term we've got the result for the app. view and seems like the proper method.

What would be super helpful, since we have many views that will benefit from this calculated field, would be to simply copy & paste to the views, vs. having to edit each view once we conquer a little bugger like this one.  For now, thank you for some good validation and reminder of the basics...
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