Documentation: Populate SharePoint Multi Choice field with several values

In order to migrate to a SharePoint library that has columns defined as "Multi Choice", you can do so as long as you insert a ';#' in between each value (without the ' )  

You can utilize this in a single index field, or a Custom Build value that has constant ;# in between each chosen field. 

Example:   A single index field with the following data:  Electrical;#Plumbing;#Maintenance;#Water will show up in Sharepoint having the following multi choice options selected:  Electrical, Plumbing, Maintenance, Water