Can I make a dropdown selection from a separate gallery? - powerapps-canvas

I have developed an application that tracks financial transactions. In the form used for data input, there is a dropdown where the user would choose the reason for the transaction from a fairly long list of choices. To clarify the choices, there is also a gallery that gives transaction codes and explanations for each of the choices in the dropdown. My client has asked if they can click on the choice in the gallery causing the dropdown to select that choice.
I created a variable that is blanked out when the screen with the form in question is opened. I also set the default of the dropdown equal to the same variable. From there I can choose an item from the gallery via an icon and set the variable equal to the desired field in the gallery, which causes the dropdown to populate with the desired value. However, if the user chooses from the dropdown first, then tries to choose from the gallery, I lose the functionality due to defaulting to the variable no longer works. I want to reset the dropdown when I choose from the gallery, but I can't get the dropdown to reset from the icon in the gallery since the gallery is outside the form.
Thanks.

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