JavaScript to get an issue's multiselect values then use values to default list on Create screen

[Michael Alexander]

I have a need that when the Issue Create is launched, I can get the initial Issue's multiselect selected values to default the multiselect values on the Issue Create screen.

I need to do this with JavaScript in a field's Description field.

I already have the JavaScript code written and working to default all the fields from initial Issue's fields, with the exception of the Initial Issue's multiselect fields.

Can someone please provide an example JavaScript code on how to -

1) retrieve the selected values list of the multiselect field on the initial Issue, and then,

2) set the values list to Create Issue multiselect field as its defaults.

Thank you in advance for your help!