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Fetching data from child table field

For example, i have created a dropdown of 10 options where the user can select the option and enter its data in the child table. The child table has been linked with the dropdown menu. Suppose a user has selected the first four options from the dropdown and has/her successfully entered the data in their child tables. Suppose the child table has different columns in which the first one is “Name of the Machine.”

Now in the next section, i want a create a field where it shows all name of the streams which the user has entered in the child table in the form of a dropdown.