Post Function - Set Custom Field value for Multi select fields

[Andrew McNab]

Hey guys, I'm trying to create a Post Function in a workflow transition that sets the value of the Custom Field where the value needs to be multiple options selected for a multiselect field.

I can't find any documentation on the syntax (i've tried commas, new lines, etc) you need to use in the Custom Field Value box for delimiting the values. I'm currently having to create multiple Post Functions where I append a single value in each Post Function.