Edit related table records directly from another table’s main form

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There are multiple ways that you can work with related table records on a table form within Power Apps. For example, you can include related tables in read-only mode with a quick view form and create or edit a record using a main form in a dialog.

Another way you can work with related table records is by adding a form component control to another table's main form. The form component control lets users edit information of a related table record directly from another table’s form.

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In some business scenarios users should only add one (or two) child records. The quickest way to enforce this in Dynamics 365 is to hide the New button after the sub-grid reaches a specific row count. This article shows how to:

1. Create a JavaScript enable rule that counts rows.
2. Refresh only that sub-grid’s ribbon so the rule re-evaluates instantly—no full form reload.

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