Multi select from connected dropdown field in add record form

I’ve seen this similar question asked before but haven’t seen a solution.
I want to associate multiple Items Sold (eg, hammer, nail, screw, pliers, etc) with a unique Sales Ticket all within one Add Record popup request.
The Items Sold field is populated by a connection to a dynamic table containing hundreds of items.
The Sales Ticket value comes from an auto increment field in a Sales table.

Any suggestions?