to convert a custom field of list type(single-select) to list-type(multiselect) in a screen?

[M GOKARI]

Please suggest if thr is a way to convert a custom field of list type(single-select) to list-type(multi-select) in a screen, without deleting the original custom single-select list

[Jack]

You can’t change a field type like this. Consider the following ideas:

• create the new MS field then using JQL search for issues by each SS field value and use bulk edit to update the MS field to be the same as that SS field value. Rinse and repeat for each SS field value then deplete the SS field.
• Create new MS field. edit the workflow and make ‘reentrant’ transitions for each status and use a Post Function to copy field value. Using JQL find issues by status and execute the reentrant transitions. Rinse and repeat then delete SS field and clean up the workflow.