Adding Multilist options to a drop down list

Adding Multilist options to a drop down list

Hello,

I have a form called Job Data which contains and ID and a Operations in the form of a Multi select List. And then there is another form Planning which also has an ID and a Operation but in the form of a drop down.

First the Job Data is Filled and Submitted. When the ID is put is in the Planning form, I want the Multiselect List in the Job Data  form appear as a drop down in the Planning form.

Can this be done ?