Change comma separated list to :: separated list

https://community.qualtrics.com/XMcommunity/discussion/comment/52867#Comment_52867You need to change the value in code.
Your code would be:
Qualtrics.SurveyEngine.addOnload(function()
{
/*Place your JavaScript here to run when the page loads*/
var string = '${q://QID5/ChoiceGroup/SelectedChoices}';
var replacestring= string.replace(/,/g , '::');
Qualtrics.SurveyEngine.setEmbeddedData( 'Roles - Combined', replacestring );

});

Qualtrics.SurveyEngine.addOnload(function()
{
/*Place your JavaScript here to run when the page loads*/
var string = '${q://QID8/ChoiceGroup/SelectedChoices}';
var replacestring= string.replace(/,/g , '::');
Qualtrics.SurveyEngine.setEmbeddedData( 'Roles - Combined', replacestring );

});

Qualtrics.SurveyEngine.addOnload(function()
{
/*Place your JavaScript here to run when the page loads*/
var string = '${q://QID9/ChoiceGroup/SelectedChoices}';
var replacestring= string.replace(/,/g , '::');
Qualtrics.SurveyEngine.setEmbeddedData( 'Roles - Combined', replacestring );

});

Qualtrics.SurveyEngine.addOnload(function()
{
/*Place your JavaScript here to run when the page loads*/
var string = '${q://QID10/ChoiceGroup/SelectedChoices}';
var replacestring= string.replace(/,/g , '::');
Qualtrics.SurveyEngine.setEmbeddedData( 'Roles - Combined', replacestring );

});
Keep the value empty like this:
Include the entire above code in the last empty question as mentioned previously and auto click it to end of survey.
this.clickNextButton();
Hope it helps!