How can I group drop down list by value

Hello Team. I have a Data view where I create a Reporting object. This object includes the Product and Mold fields, that relate to another object. When I choose a Product, the Mold will be selected automatically, but currently it`s not grouped, so I have a picture like on screenshot. I just have to group Mold list. How can I do it?
1 answers

If you use a reference selector you could use the sort order: