How to pass a value to a Modal form and manage the output of form select options on said form, angularJS Style!

I have a simple single page application with some data output on it.  If a user clicks on the USERNAME, the changeABuyer function initiates a modal form which transitions in.  The modal form contains a form select with all available USERNAMES.

What I would like to learn is two fold:
A: Pass the USERNAME that the user clicks to the 'changeAUserModal' modal form, and OMIT USERNAME from Select Options of the changeAUserModal Modal Form
B: Pass the USERNAME that the user clicks to the 'changeAUserModal' modal form, , and tag USERNAME as 'SELECTED' in the Select Options of the changeAUserModal Modal Form

USERNAME Data Output within SPA Index:
ow="fsID" ng-repeat="f in currentRulesF" ng-model="fedTable" ng-if="f.USERNAME != 'FAILURE'">
    <td ng-click="changeABuyer($index)" class="pointer">{{f.USERNAME}}</td>
    <td ng-click="changeARange($index)" class="pointer">{{f.LOW_DOLLAR}} - {{f.HIGH_DOLLAR}}</td>
        <button class="btn btn-primary" id="removeRule" type="button" ng-click="removeRule($index)">
            <span class="glyphicon glyphicon-minus" aria-hidden="true"></span> Rule

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changeABuyer Function within controller.js
ope.changeABuyer = function(index) {
    $scope.changeIndex = index;
    $scope.BuyerDD = "";

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changeAUserModal Modal Form within SPA Index:
<div class="modal fade" role="dialog" id="changeAUserModal">
    <div class="modal-dialog modal-sm">
        <div class="modal-content">
            <div class="modal-header">
                <button class="close" data-dismiss="modal" aira-hidden="true">×</button>
                <h3>Change A Buyer</h3>
            <div class="modal-body">
                <select ng-model="BuyerChangeDD" id="BuyerChangeDD" ng-options="aBuyer.NAME for aBuyer in buyerList"></select>
            <div class="modal-footer">
                <a class="btn btn-primary" ng-click="BuyerChanged(BuyerChangeDD)" type="submit">Change</a>
                <a href="#" class="btn" data-dismiss="modal">Cancel</a>
    <button ng-show="changesMade" type="button" class="btn btn-default" ng-click="saveRules()">Save Changes</button>

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brianmfallsAuthor Commented:
I managed to answer half of my question...  The changes I made pass in the USERNAME, and make sure that the USERNAME is selected in the drop down list.

Change to Data Output (Link) - Passing ",f.USERNAME" as an attribute of the changeABuyer function:
<td ng-click="changeABuyer($index,f.USERNAME)" class="pointer">{{f.USERNAME}}</td>

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Addition & Change to changeABuyer function - Added 'userName' as a function attribute and added line beginning with "$scope.BuyerChangeDD":
$scope.changeABuyer = function(index,userName) { //change
    $scope.changeIndex = index;
    $scope.BuyerDD = "";
    $scope.BuyerChangeDD = { NAME: userName };  //addition

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Change to Form Select Element - Appended " track by aBuyer.NAME" to the ng-options attribute:
<select ng-model="BuyerChangeDD" id="BuyerChangeDD" ng-options="aBuyer.NAME for aBuyer in buyerList track by aBuyer.NAME"></select>

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brianmfallsAuthor Commented:
I suppose half of a solution is better than no solution.
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