// Function to populate a specified dropdown based on the selections of "Group 1 - 1:" through "Group 1 - 6:"
function populateDropdown(dropdownFieldName) {
    // Retrieve the current selections from Group 1 dropdowns
    var groupSelections = [
        this.getField("Group 1 - 1:").valueAsString,
        this.getField("Group 1 - 2:").valueAsString,
        this.getField("Group 1 - 3:").valueAsString,
        this.getField("Group 1 - 4:").valueAsString,
        this.getField("Group 1 - 5:").valueAsString,
        this.getField("Group 1 - 6:").valueAsString
    ];

    // Filter out empty selections
    var validSelections = groupSelections.filter(function(selection) {
        return selection !== "";  // Exclude empty or unselected values
    }).map(String);  // Convert all selections to strings

    // Forcefully include "49rs" if it's selected but not recognized
    if (validSelections.indexOf("49rs") === -1 && groupSelections.includes("49rs")) {
        validSelections.push("49rs");
    }

    // Sort and deduplicate the selections
    var uniqueSelections = [...new Set(validSelections.sort())];

    // Store the current value of the specified dropdown
    var dropdown = this.getField(dropdownFieldName);
    var currentValue = dropdown.valueAsString;

    // Clear existing items in the specified dropdown
    dropdown.clearItems();

    // Populate new options in the specified dropdown based on the valid selections
    dropdown.setItems(uniqueSelections);

    // Retain the previous selection if it exists in the new options
    if (uniqueSelections.indexOf(currentValue) !== -1) {
        dropdown.value = currentValue;
    }
}